diff --git a/backend/dist/index.js b/backend/dist/index.js
index 5fa2e9c..1b637b4 100644
--- a/backend/dist/index.js
+++ b/backend/dist/index.js
@@ -97,6 +97,18 @@ async function initializeDatabase() {
     await pool.query(`ALTER TABLE telegram_channel_subscriptions ADD COLUMN IF NOT EXISTS source_type TEXT DEFAULT 'public'`);
     await pool.query(`ALTER TABLE telegram_channel_subscriptions ADD COLUMN IF NOT EXISTS disabled_reason TEXT`);
     await pool.query(`ALTER TABLE telegram_channel_subscriptions ADD COLUMN IF NOT EXISTS disabled_at TIMESTAMPTZ`);
+    await pool.query(`CREATE TABLE IF NOT EXISTS storage_account_cooldowns (
+            id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+            storage_account_id UUID REFERENCES storage_accounts(id) ON DELETE CASCADE,
+            provider VARCHAR(50) NOT NULL,
+            reason VARCHAR(100) NOT NULL,
+            cooldown_until TIMESTAMPTZ NOT NULL,
+            last_error TEXT,
+            created_at TIMESTAMPTZ DEFAULT NOW(),
+            updated_at TIMESTAMPTZ DEFAULT NOW(),
+            UNIQUE(storage_account_id, provider, reason)
+        )`);
+    await pool.query(`CREATE INDEX IF NOT EXISTS idx_storage_account_cooldowns_until ON storage_account_cooldowns(cooldown_until)`);
     await pool.query(`CREATE UNIQUE INDEX IF NOT EXISTS idx_api_keys_key_hash ON api_keys(key_hash) WHERE key_hash IS NOT NULL`);
     console.log("\u2705 \u6570\u636E\u5E93\u8868\u7ED3\u6784\u521D\u59CB\u5316\u5B8C\u6210");
   } catch (err) {
@@ -347,6 +359,72 @@ var init_localPath = __esm({
   }
 });
 
+// src/services/storageCooldown.ts
+async function ensureStorageCooldownSchema() {
+  await query(`
+        CREATE TABLE IF NOT EXISTS storage_account_cooldowns (
+            id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+            storage_account_id UUID REFERENCES storage_accounts(id) ON DELETE CASCADE,
+            provider VARCHAR(50) NOT NULL,
+            reason VARCHAR(100) NOT NULL,
+            cooldown_until TIMESTAMPTZ NOT NULL,
+            last_error TEXT,
+            created_at TIMESTAMPTZ DEFAULT NOW(),
+            updated_at TIMESTAMPTZ DEFAULT NOW(),
+            UNIQUE(storage_account_id, provider, reason)
+        )
+    `);
+  await query(`CREATE INDEX IF NOT EXISTS idx_storage_account_cooldowns_until ON storage_account_cooldowns(cooldown_until)`);
+}
+async function markStorageAccountCooldown(storageAccountId, provider, reason, cooldownUntil, error) {
+  if (!storageAccountId) return;
+  await ensureStorageCooldownSchema();
+  await query(
+    `INSERT INTO storage_account_cooldowns (storage_account_id, provider, reason, cooldown_until, last_error, updated_at)
+         VALUES ($1, $2, $3, $4, $5, NOW())
+         ON CONFLICT (storage_account_id, provider, reason)
+         DO UPDATE SET cooldown_until = EXCLUDED.cooldown_until, last_error = EXCLUDED.last_error, updated_at = NOW()`,
+    [storageAccountId, provider, reason, cooldownUntil, error || null]
+  );
+}
+async function getStorageAccountCooldown(storageAccountId, provider, reason = STORAGE_COOLDOWN_REASON_DAILY_UPLOAD_LIMIT) {
+  if (!storageAccountId) return null;
+  await ensureStorageCooldownSchema();
+  const result = await query(
+    `SELECT storage_account_id, provider, reason, cooldown_until, last_error
+         FROM storage_account_cooldowns
+         WHERE storage_account_id = $1
+           AND provider = $2
+           AND reason = $3
+           AND cooldown_until > NOW()
+         LIMIT 1`,
+    [storageAccountId, provider, reason]
+  );
+  const row = result.rows[0];
+  if (!row) return null;
+  return {
+    storageAccountId: row.storage_account_id,
+    provider: row.provider,
+    reason: row.reason,
+    cooldownUntil: new Date(row.cooldown_until),
+    lastError: row.last_error
+  };
+}
+async function clearExpiredStorageCooldowns() {
+  await ensureStorageCooldownSchema();
+  const result = await query(`DELETE FROM storage_account_cooldowns WHERE cooldown_until <= NOW()`);
+  return result.rowCount || 0;
+}
+var STORAGE_COOLDOWN_REASON_DAILY_UPLOAD_LIMIT, DEFAULT_STORAGE_COOLDOWN_MS;
+var init_storageCooldown = __esm({
+  "src/services/storageCooldown.ts"() {
+    "use strict";
+    init_db();
+    STORAGE_COOLDOWN_REASON_DAILY_UPLOAD_LIMIT = "daily_upload_limit";
+    DEFAULT_STORAGE_COOLDOWN_MS = 24 * 60 * 60 * 1e3;
+  }
+});
+
 // src/services/storage.ts
 var storage_exports = {};
 __export(storage_exports, {
@@ -356,7 +434,9 @@ __export(storage_exports, {
   OneDriveStorageProvider: () => OneDriveStorageProvider,
   S3StorageProvider: () => S3StorageProvider,
   StorageManager: () => StorageManager,
+  StorageQuotaCooldownError: () => StorageQuotaCooldownError,
   WebDAVStorageProvider: () => WebDAVStorageProvider,
+  isStorageQuotaCooldownError: () => isStorageQuotaCooldownError,
   storageManager: () => storageManager
 });
 import fs4 from "fs";
@@ -367,13 +447,48 @@ import { S3Client, PutObjectCommand, GetObjectCommand, DeleteObjectCommand, Head
 import { getSignedUrl as getS3SignedUrl } from "@aws-sdk/s3-request-presigner";
 import { createClient } from "webdav";
 import { google } from "googleapis";
-var LocalStorageProvider, AliyunOSSStorageProvider, S3StorageProvider, WebDAVStorageProvider, OneDriveStorageProvider, GoogleDriveStorageProvider, StorageManager, storageManager;
+function isStorageQuotaCooldownError(error) {
+  return error instanceof StorageQuotaCooldownError || error?.name === "StorageQuotaCooldownError";
+}
+function googleDriveErrorText(error) {
+  const pieces = [
+    error?.message,
+    error?.errorMessage,
+    error?.response?.data ? JSON.stringify(error.response.data) : void 0,
+    error?.errors ? JSON.stringify(error.errors) : void 0
+  ].filter(Boolean);
+  return pieces.join(" ");
+}
+function isGoogleDriveDailyUploadLimitError(error) {
+  const status = Number(error?.code || error?.response?.status || error?.status || 0);
+  const text = googleDriveErrorText(error);
+  if (status !== 403) return false;
+  return /Drive upload limit|exceeded their Drive upload limit|exceeded.*upload limit|upload limit exceeded|upload limit/i.test(text);
+}
+var StorageQuotaCooldownError, LocalStorageProvider, AliyunOSSStorageProvider, S3StorageProvider, WebDAVStorageProvider, OneDriveStorageProvider, GoogleDriveStorageProvider, StorageManager, storageManager;
 var init_storage = __esm({
   "src/services/storage.ts"() {
     "use strict";
     init_db();
     init_localPath();
     init_credentialCrypto();
+    init_storageCooldown();
+    StorageQuotaCooldownError = class extends Error {
+      provider;
+      reason;
+      storageAccountId;
+      cooldownUntil;
+      originalError;
+      constructor(message, options) {
+        super(message);
+        this.name = "StorageQuotaCooldownError";
+        this.provider = options.provider;
+        this.reason = options.reason;
+        this.storageAccountId = options.storageAccountId;
+        this.cooldownUntil = options.cooldownUntil || new Date(Date.now() + DEFAULT_STORAGE_COOLDOWN_MS);
+        this.originalError = options.originalError;
+      }
+    };
     LocalStorageProvider = class {
       name = "local";
       uploadDir;
@@ -1222,6 +1337,14 @@ var init_storage = __esm({
           return file.data.id;
         } catch (error) {
           console.error("[GoogleDrive] Upload failed:", error.message);
+          if (isGoogleDriveDailyUploadLimitError(error)) {
+            throw new StorageQuotaCooldownError("Google Drive \u4ECA\u65E5\u4E0A\u4F20\u989D\u5EA6\u5DF2\u8FBE\u4E0A\u9650\uFF0C\u4EFB\u52A1\u5C06\u81EA\u52A8\u6682\u505C 24 \u5C0F\u65F6\u540E\u7EE7\u7EED\u3002", {
+              provider: "google_drive",
+              reason: STORAGE_COOLDOWN_REASON_DAILY_UPLOAD_LIMIT,
+              storageAccountId: this.id,
+              originalError: error
+            });
+          }
           throw new Error(`Google Drive upload failed: ${error.message}`);
         }
       }
@@ -2850,6 +2973,58 @@ async function getImageDimensions(filePath, mimeType) {
 // src/services/telegramUpload.ts
 init_storage();
 
+// src/services/storageCooldownGuard.ts
+init_storage();
+init_storageCooldown();
+function formatStorageCooldownNotice(cooldownUntil) {
+  return [
+    "\u23F8\uFE0F Google Drive \u4ECA\u65E5\u4E0A\u4F20\u989D\u5EA6\u5DF2\u8FBE\u4E0A\u9650",
+    "",
+    "\u5F53\u524D\u4EFB\u52A1\u5DF2\u81EA\u52A8\u6682\u505C\uFF0C\u9884\u8BA1 24 \u5C0F\u65F6\u540E\u7EE7\u7EED\u3002",
+    "\u5269\u4F59\u6587\u4EF6\u4E0D\u4F1A\u4E22\u5931\uFF0C\u6062\u590D\u540E\u4F1A\u4ECE\u672A\u5B8C\u6210\u90E8\u5206\u7EE7\u7EED\u5904\u7406\u3002",
+    "",
+    `\u6062\u590D\u65F6\u95F4\uFF1A${cooldownUntil.toISOString()}`
+  ].join("\n");
+}
+function buildStorageCooldownHttpError(error) {
+  return {
+    status: 429,
+    body: {
+      error: error.message || "Google Drive \u4ECA\u65E5\u4E0A\u4F20\u989D\u5EA6\u5DF2\u8FBE\u4E0A\u9650\uFF0C\u8BF7\u7A0D\u540E\u91CD\u8BD5\u3002",
+      code: "storage_account_cooling",
+      provider: error.provider,
+      reason: error.reason,
+      retryAt: error.cooldownUntil.toISOString()
+    }
+  };
+}
+function sendStorageCooldownHttpError(res, error) {
+  const payload = buildStorageCooldownHttpError(error);
+  res.status(payload.status).json(payload.body);
+}
+async function getActiveStorageCooldown() {
+  const provider = storageManager.getProvider();
+  const activeAccountId = storageManager.getActiveAccountId();
+  if (provider.name !== "google_drive" || !activeAccountId) return null;
+  return getStorageAccountCooldown(activeAccountId, provider.name, STORAGE_COOLDOWN_REASON_DAILY_UPLOAD_LIMIT);
+}
+async function assertActiveStorageWritable() {
+  const cooldown = await getActiveStorageCooldown();
+  if (!cooldown) return;
+  throw new StorageQuotaCooldownError("Google Drive \u4ECA\u65E5\u4E0A\u4F20\u989D\u5EA6\u5DF2\u8FBE\u4E0A\u9650\uFF0C\u8BF7\u7B49\u5F85\u81EA\u52A8\u6062\u590D\u540E\u518D\u4E0A\u4F20\uFF0C\u6216\u4E34\u65F6\u5207\u6362\u5176\u5B83\u5B58\u50A8\u6E90\u3002", {
+    provider: cooldown.provider,
+    reason: cooldown.reason,
+    storageAccountId: cooldown.storageAccountId,
+    cooldownUntil: cooldown.cooldownUntil
+  });
+}
+function isStorageCooldownError(error) {
+  return isStorageQuotaCooldownError(error);
+}
+
+// src/services/telegramUpload.ts
+init_storageCooldown();
+
 // src/services/telegramUserClient.ts
 import fs6 from "fs";
 import path7 from "path";
@@ -4430,6 +4605,7 @@ async function processFileUpload(client2, file, queue) {
     let storedName;
     try {
       const activeAccountId = storageManager.getActiveAccountId();
+      await assertActiveStorageWritable();
       const chatName = await getTelegramChatName(file.message);
       const batchFolder = null;
       const storageRules = await getStoragePathRules();
@@ -4511,7 +4687,13 @@ async function processFileUpload(client2, file, queue) {
       });
     } catch (error) {
       console.error("\u{1F916} \u6587\u4EF6\u4E0A\u4F20\u5931\u8D25:", error);
-      file.error = error.message;
+      if (isStorageQuotaCooldownError(error)) {
+        await markStorageAccountCooldown(error.storageAccountId || storageManager.getActiveAccountId(), error.provider, error.reason, error.cooldownUntil, error.message);
+        file.storageCooldownUntil = error.cooldownUntil;
+        file.error = formatStorageCooldownNotice(error.cooldownUntil);
+      } else {
+        file.error = error.message;
+      }
       if (localFilePath && fs7.existsSync(localFilePath)) {
         try {
           fs7.unlinkSync(localFilePath);
@@ -4526,7 +4708,7 @@ async function processFileUpload(client2, file, queue) {
   const queueTask = async (signal) => {
     file.status = "uploading";
     const firstAttemptSuccess = await attemptUpload(signal);
-    if (!firstAttemptSuccess && !signal.aborted && !file.retried) {
+    if (!firstAttemptSuccess && !signal.aborted && !file.retried && !file.storageCooldownUntil) {
       file.retried = true;
       file.status = "uploading";
       file.error = void 0;
@@ -4902,6 +5084,13 @@ async function downloadTelegramChannelRange(botClient, requestMessage, source, s
           successful += 1;
           successfulMessageIds.push(item.id);
           await onItemSettled?.(item, "success");
+        } else if (uploadItem.storageCooldownUntil) {
+          throw new StorageQuotaCooldownError(uploadItem.error || "Google Drive \u4ECA\u65E5\u4E0A\u4F20\u989D\u5EA6\u5DF2\u8FBE\u4E0A\u9650\uFF0C\u4EFB\u52A1\u5C06\u81EA\u52A8\u6682\u505C 24 \u5C0F\u65F6\u540E\u7EE7\u7EED\u3002", {
+            provider: "google_drive",
+            reason: "daily_upload_limit",
+            storageAccountId: storageManager.getActiveAccountId() || void 0,
+            cooldownUntil: uploadItem.storageCooldownUntil
+          });
         } else {
           failed += 1;
           failedMessageIds.push(item.id);
@@ -5299,8 +5488,10 @@ init_storage();
 
 // src/services/telegramChannelJobs.ts
 init_db();
+init_storage();
 import { Api as Api5 } from "telegram";
 import { getPeerId } from "telegram/Utils.js";
+init_storageCooldown();
 var SUBSCRIPTION_INTERVAL_MS = Math.max(6e4, parseInt(process.env.TELEGRAM_SUBSCRIPTION_INTERVAL_MS || "300000", 10) || 3e5);
 var SUBSCRIPTION_SCAN_LIMIT = Math.max(1, parseInt(process.env.TELEGRAM_SUBSCRIPTION_SCAN_LIMIT || "100", 10) || 100);
 var TG_JOB_RECOVERY_DELAY_MS = Math.max(1e3, parseInt(process.env.TG_JOB_RECOVERY_DELAY_MS || "10000", 10) || 1e4);
@@ -5802,12 +5993,62 @@ function isFloodWait(error) {
   if (seconds > 0 || /FLOOD|Too many requests/i.test(text)) return { seconds: Math.max(30, seconds || 60) };
   return null;
 }
+async function putJobIntoStorageCooldown(jobId, cooldownUntil, reasonText) {
+  await updateJob(jobId, {
+    status: "cooling",
+    download_status: "cooling",
+    cooldown_until: cooldownUntil,
+    error: reasonText
+  });
+  await query(
+    `UPDATE telegram_download_items
+         SET status = 'pending', locked_at = NULL, last_error = $2, updated_at = NOW()
+         WHERE job_id = $1
+           AND status = 'downloading'`,
+    [jobId, reasonText]
+  );
+}
+async function applyStorageCooldownIfNeeded(jobId) {
+  const provider = storageManager.getProvider();
+  const activeAccountId = storageManager.getActiveAccountId();
+  if (provider.name !== "google_drive" || !activeAccountId) return null;
+  const cooldown = await getStorageAccountCooldown(activeAccountId, provider.name, STORAGE_COOLDOWN_REASON_DAILY_UPLOAD_LIMIT);
+  if (!cooldown) return null;
+  await putJobIntoStorageCooldown(jobId, cooldown.cooldownUntil, `Google Drive \u4ECA\u65E5\u4E0A\u4F20\u989D\u5EA6\u5DF2\u8FBE\u4E0A\u9650\uFF0C\u81EA\u52A8\u6682\u505C\u5230 ${cooldown.cooldownUntil.toISOString()}`);
+  return cooldown;
+}
+async function notifyStorageCooldownOnce(botClient, job, cooldownUntil) {
+  const params = job.params || {};
+  if (params.storageQuotaNoticeSentAt) return;
+  const nextParams = { ...params, storageQuotaNoticeSentAt: (/* @__PURE__ */ new Date()).toISOString(), storageQuotaCooldownUntil: cooldownUntil.toISOString() };
+  await updateJob(job.id, { params: JSON.stringify(nextParams) });
+  const targetChat = job.chat_id || job.user_id;
+  await botClient.sendMessage(targetChat, {
+    message: [
+      formatStorageCooldownNotice(cooldownUntil),
+      "",
+      `\u4EFB\u52A1\uFF1A${String(job.id).slice(0, 8)}`
+    ].join("\n")
+  }).catch(() => void 0);
+}
+async function handleStorageQuotaCooldownError(botClient, jobId, error) {
+  if (!isStorageQuotaCooldownError(error)) return false;
+  const cooldownUntil = error.cooldownUntil;
+  await markStorageAccountCooldown(error.storageAccountId || storageManager.getActiveAccountId(), error.provider, error.reason, cooldownUntil, error.message);
+  await putJobIntoStorageCooldown(jobId, cooldownUntil, error.message);
+  const job = await getJob(jobId);
+  if (job) await notifyStorageCooldownOnce(botClient, job, cooldownUntil);
+  return true;
+}
 async function ensureJobCanRun(jobId) {
   const job = await getJob(jobId);
   if (!job) return "cancelled";
   if (job.cancelled_at || job.status === "cancelled") return "cancelled";
   if (job.paused_at || job.status === "paused") return "paused";
   if (job.cooldown_until && new Date(job.cooldown_until).getTime() > Date.now()) return "cooldown";
+  if (job.status === "cooling" && (!job.cooldown_until || new Date(job.cooldown_until).getTime() <= Date.now())) return "run";
+  const storageCooldown = await applyStorageCooldownIfNeeded(jobId);
+  if (storageCooldown) return "cooldown";
   return "run";
 }
 async function waitUntilRunnable(jobId, options) {
@@ -5862,6 +6103,9 @@ async function downloadClaimedRefs(botClient, requestMessage, jobId, source, ref
       for (const ref of refs) await markDownloadRefStatus(jobId, ref, "failed", `FloodWait ${flood.seconds}s`);
       return { found: 0, skipped: 0, failed: refs.length, successful: 0 };
     }
+    if (await handleStorageQuotaCooldownError(botClient, jobId, error)) {
+      return { found: 0, skipped: 0, failed: 0, successful: 0 };
+    }
     for (const ref of refs) await markDownloadRefStatus(jobId, ref, "failed", error instanceof Error ? error.message : String(error));
     throw error;
   }
@@ -6078,7 +6322,7 @@ async function listTelegramActiveTaskQueues(userId, limit = 10) {
                    )
                )
                OR (
-                   j.status = 'paused'
+                   j.status IN ('paused', 'cooling')
                    AND (COALESCE(s.pending_count, 0) > 0 OR COALESCE(s.downloading_count, 0) > 0 OR j.scan_status = 'scanning')
                )
            )
@@ -6187,6 +6431,11 @@ async function runSubscriptionScan(botClient) {
       const subscriptionRefs = candidateMessages.map((message) => toChannelDownloadRef(row.source, message)).filter((ref) => Boolean(ref));
       await markDownloadRefsDownloading(jobId, subscriptionRefs);
       const downloadResult = await downloadTelegramChannelRange(botClient, requestMessage, row.source, 0, ids.length, "newer", ids, row.folder_override || null, subscriptionRefs, (ref, status, error) => markDownloadRefStatus(jobId, ref, status, error));
+      const cooledJob = await getJob(jobId);
+      if (cooledJob?.status === "cooling") {
+        await notifyStorageCooldownOnce(botClient, cooledJob, new Date(cooledJob.cooldown_until));
+        continue;
+      }
       await updateJob(jobId, {
         status: downloadResult.failed > 0 ? "completed_with_errors" : "completed",
         enqueued_count: downloadResult.found,
@@ -6261,6 +6510,11 @@ async function recoverTelegramJob(botClient, job) {
       refs,
       (ref, status, error) => markDownloadRefStatus(job.id, ref, status, error)
     );
+    const cooledJob = await getJob(job.id);
+    if (cooledJob?.status === "cooling") {
+      await notifyStorageCooldownOnce(botClient, cooledJob, new Date(cooledJob.cooldown_until));
+      return;
+    }
     await updateJob(job.id, {
       status: result.failed > 0 ? "completed_with_errors" : "completed",
       enqueued_count: result.found,
@@ -6280,6 +6534,16 @@ async function recoverInterruptedTelegramJobs(botClient) {
   if (recoveryRunning) return;
   recoveryRunning = true;
   try {
+    await clearExpiredStorageCooldowns();
+    await query(
+      `UPDATE telegram_background_jobs
+             SET status = 'running', download_status = 'active', cooldown_until = NULL, error = NULL, updated_at = NOW()
+             WHERE status = 'cooling'
+               AND cooldown_until IS NOT NULL
+               AND cooldown_until <= NOW()
+               AND cancelled_at IS NULL
+               AND finished_at IS NULL`
+    );
     await query(
       `UPDATE telegram_download_items
              SET status = 'pending', locked_at = NULL, updated_at = NOW()
@@ -6293,7 +6557,7 @@ async function recoverInterruptedTelegramJobs(botClient) {
              WHERE j.kind IN ('date_range', 'tag_download')
                AND j.finished_at IS NULL
                AND j.cancelled_at IS NULL
-               AND j.status IN ('pending', 'running', 'failed', 'completed_with_errors')
+               AND j.status IN ('pending', 'running', 'failed', 'completed_with_errors', 'cooling')
                AND i.status = 'pending'
              ORDER BY j.created_at ASC
              LIMIT 5`
@@ -7710,6 +7974,7 @@ import fs10 from "fs";
 import path14 from "path";
 import { spawn } from "child_process";
 import os2 from "os";
+init_storageCooldown();
 var YtDlpQueue = class {
   constructor(maxConcurrent) {
     this.maxConcurrent = maxConcurrent;
@@ -7803,6 +8068,7 @@ async function runYtDlpDownload(url, taskDir) {
 async function uploadDownloadedFile(localFilePath, originalFileName) {
   const provider = storageManager.getProvider();
   const activeAccountId = storageManager.getActiveAccountId();
+  await assertActiveStorageWritable();
   const safeName = sanitizeFilename(originalFileName);
   const ext = path14.extname(safeName) || path14.extname(localFilePath) || "";
   const mimeType = getMimeTypeFromFilename(safeName);
@@ -7876,12 +8142,23 @@ Task: ${task.id}` });
       task.status = "failed";
       task.finishedAt = Date.now();
       task.error = e instanceof Error ? e.message : String(e);
-      const errText = (task.error || "\u672A\u77E5\u9519\u8BEF").toString().trim();
-      const trimmed = errText.length > 1500 ? errText.slice(0, 1500) + "..." : errText;
-      try {
-        await message.reply({ message: `\u274C \u4E0B\u8F7D/\u4E0A\u4F20\u5931\u8D25
+      let replyText;
+      if (isStorageQuotaCooldownError(e)) {
+        await markStorageAccountCooldown(e.storageAccountId || storageManager.getActiveAccountId(), e.provider, e.reason, e.cooldownUntil, e.message);
+        replyText = [
+          formatStorageCooldownNotice(e.cooldownUntil),
+          "",
+          "yt-dlp \u4EFB\u52A1\u6CA1\u6709\u6301\u4E45\u5316\u6062\u590D\u961F\u5217\uFF1B\u8BF7\u5728\u6062\u590D\u65F6\u95F4\u540E\u91CD\u65B0\u53D1\u9001\u8BE5\u94FE\u63A5\uFF0C\u6216\u5148\u5207\u6362\u5176\u5B83\u5B58\u50A8\u6E90\u3002"
+        ].join("\n");
+      } else {
+        const errText = (task.error || "\u672A\u77E5\u9519\u8BEF").toString().trim();
+        const trimmed = errText.length > 1500 ? errText.slice(0, 1500) + "..." : errText;
+        replyText = `\u274C \u4E0B\u8F7D/\u4E0A\u4F20\u5931\u8D25
 
-\u539F\u56E0: ${trimmed}` });
+\u539F\u56E0: ${trimmed}`;
+      }
+      try {
+        await message.reply({ message: replyText });
       } catch {
       }
     } finally {
@@ -8148,7 +8425,7 @@ function isDateOnly(text) {
 async function updateJobProgressMessage(statusMessage, summary) {
   const totalDone = summary.completed + summary.failed + summary.skipped;
   const lines = [
-    summary.status === "paused" ? `\u23F8\uFE0F **\u9891\u9053\u4E0B\u8F7D\u5DF2\u6682\u505C**` : summary.status === "cancelled" ? `\u{1F6D1} **\u9891\u9053\u4E0B\u8F7D\u5DF2\u53D6\u6D88**` : totalDone >= summary.totalMediaFound && summary.scanStatus === "done" ? `\u2705 **\u9891\u9053\u4EFB\u52A1\u5B8C\u6210**` : `\u{1F50E} **\u9891\u9053\u4EFB\u52A1\u8FD0\u884C\u4E2D**`,
+    summary.status === "paused" ? `\u23F8\uFE0F **\u9891\u9053\u4E0B\u8F7D\u5DF2\u6682\u505C**` : summary.status === "cooling" ? `\u23F8\uFE0F **Google Drive \u9650\u989D\u51B7\u5374\u4E2D**` : summary.status === "cancelled" ? `\u{1F6D1} **\u9891\u9053\u4E0B\u8F7D\u5DF2\u53D6\u6D88**` : totalDone >= summary.totalMediaFound && summary.scanStatus === "done" ? `\u2705 **\u9891\u9053\u4EFB\u52A1\u5B8C\u6210**` : `\u{1F50E} **\u9891\u9053\u4EFB\u52A1\u8FD0\u884C\u4E2D**`,
     `\u{1F194} job: ${summary.jobId.slice(0, 8)}`,
     `\u{1F4CD} \u9891\u9053\uFF1A${summary.source}`,
     ``,
@@ -8158,7 +8435,7 @@ async function updateJobProgressMessage(statusMessage, summary) {
     ``,
     `\u2B07\uFE0F \u4E0B\u8F7D\uFF1A${summary.downloadStatus}`,
     `\u2705 \u6210\u529F ${summary.completed}\u3000\u23F3 \u5F85\u4E0B\u8F7D ${summary.pending}\u3000\u{1F504} \u4E0B\u8F7D\u4E2D ${summary.downloading}\u3000\u274C \u5931\u8D25 ${summary.failed}\u3000\u23ED \u8DF3\u8FC7 ${summary.skipped}`,
-    summary.cooldownUntil ? `\u23F3 FloodWait \u51B7\u5374\u5230\uFF1A${summary.cooldownUntil}` : "",
+    summary.cooldownUntil ? summary.status === "cooling" ? `\u23F8\uFE0F Google Drive \u9650\u989D\u51B7\u5374\u5230\uFF1A${summary.cooldownUntil}` : `\u23F3 FloodWait \u51B7\u5374\u5230\uFF1A${summary.cooldownUntil}` : "",
     ``,
     `\u63A7\u5236\uFF1A/task_pause ${summary.jobId.slice(0, 8)} \xB7 /task_resume ${summary.jobId.slice(0, 8)} \xB7 /task_cancel ${summary.jobId.slice(0, 8)}`
   ].filter(Boolean);
@@ -10682,6 +10959,7 @@ var handleUpload = async (req, res, source = "web") => {
   console.log(`[Upload] \u{1F3E0} Local temp path: ${tempPath}`);
   try {
     const provider = storageManager.getProvider();
+    await assertActiveStorageWritable();
     console.log(`[Upload] \u{1F6E0}\uFE0F  Current storage provider: ${provider.name}, activeAccountId: ${activeAccountId || "none (local)"}`);
     let thumbnailPath = null;
     let previewPath = null;
@@ -10784,6 +11062,9 @@ var handleUpload = async (req, res, source = "web") => {
   } catch (error) {
     console.error("\u4E0A\u4F20\u5904\u7406\u5931\u8D25:", error);
     if (fs13.existsSync(tempPath)) fs13.unlinkSync(tempPath);
+    if (isStorageCooldownError(error)) {
+      return sendStorageCooldownHttpError(res, error);
+    }
     res.status(500).json({ error: "\u6587\u4EF6\u4E0A\u4F20\u5931\u8D25" });
   }
 };
@@ -11511,6 +11792,7 @@ router6.post("/complete", async (req, res) => {
     let width = null;
     let height = null;
     const provider = storageManager.getProvider();
+    await assertActiveStorageWritable();
     if (provider.name === "local" && (session.mimeType.startsWith("image/") || session.mimeType.startsWith("video/"))) {
       try {
         console.log(`[ChunkedComplete] \u{1F5BC}\uFE0F  MIME: ${session.mimeType}, starting generation...`);
@@ -11585,6 +11867,9 @@ router6.post("/complete", async (req, res) => {
     });
   } catch (error) {
     console.error("\u5B8C\u6210\u4E0A\u4F20\u5931\u8D25:", error);
+    if (isStorageCooldownError(error)) {
+      return sendStorageCooldownHttpError(res, error);
+    }
     res.status(500).json({ error: "\u5B8C\u6210\u4E0A\u4F20\u5931\u8D25" });
   }
 });
diff --git a/backend/src/db/index.ts b/backend/src/db/index.ts
index ac0c11c..05b38b9 100644
--- a/backend/src/db/index.ts
+++ b/backend/src/db/index.ts
@@ -107,6 +107,18 @@ async function initializeDatabase() {
         await pool.query(`ALTER TABLE telegram_channel_subscriptions ADD COLUMN IF NOT EXISTS source_type TEXT DEFAULT 'public'`);
         await pool.query(`ALTER TABLE telegram_channel_subscriptions ADD COLUMN IF NOT EXISTS disabled_reason TEXT`);
         await pool.query(`ALTER TABLE telegram_channel_subscriptions ADD COLUMN IF NOT EXISTS disabled_at TIMESTAMPTZ`);
+        await pool.query(`CREATE TABLE IF NOT EXISTS storage_account_cooldowns (
+            id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+            storage_account_id UUID REFERENCES storage_accounts(id) ON DELETE CASCADE,
+            provider VARCHAR(50) NOT NULL,
+            reason VARCHAR(100) NOT NULL,
+            cooldown_until TIMESTAMPTZ NOT NULL,
+            last_error TEXT,
+            created_at TIMESTAMPTZ DEFAULT NOW(),
+            updated_at TIMESTAMPTZ DEFAULT NOW(),
+            UNIQUE(storage_account_id, provider, reason)
+        )`);
+        await pool.query(`CREATE INDEX IF NOT EXISTS idx_storage_account_cooldowns_until ON storage_account_cooldowns(cooldown_until)`);
         await pool.query(`CREATE UNIQUE INDEX IF NOT EXISTS idx_api_keys_key_hash ON api_keys(key_hash) WHERE key_hash IS NOT NULL`);
 
         console.log('✅ 数据库表结构初始化完成');
diff --git a/backend/src/db/schema.sql b/backend/src/db/schema.sql
index 948f6bd..c5dd059 100644
--- a/backend/src/db/schema.sql
+++ b/backend/src/db/schema.sql
@@ -28,6 +28,26 @@ CREATE OR REPLACE TRIGGER storage_accounts_updated_at
     FOR EACH ROW
     EXECUTE FUNCTION update_updated_at();
 
+-- 存储账户冷却表（如 Google Drive 每日上传限额触发后暂停 24 小时）
+CREATE TABLE IF NOT EXISTS storage_account_cooldowns (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    storage_account_id UUID REFERENCES storage_accounts(id) ON DELETE CASCADE,
+    provider VARCHAR(50) NOT NULL,
+    reason VARCHAR(100) NOT NULL,
+    cooldown_until TIMESTAMPTZ NOT NULL,
+    last_error TEXT,
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    updated_at TIMESTAMPTZ DEFAULT NOW(),
+    UNIQUE(storage_account_id, provider, reason)
+);
+
+CREATE INDEX IF NOT EXISTS idx_storage_account_cooldowns_until ON storage_account_cooldowns(cooldown_until);
+
+CREATE OR REPLACE TRIGGER storage_account_cooldowns_updated_at
+    BEFORE UPDATE ON storage_account_cooldowns
+    FOR EACH ROW
+    EXECUTE FUNCTION update_updated_at();
+
 -- 文件表
 CREATE TABLE IF NOT EXISTS files (
     id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
diff --git a/backend/src/routes/chunkedUpload.ts b/backend/src/routes/chunkedUpload.ts
index 8b26903..087ecd3 100644
--- a/backend/src/routes/chunkedUpload.ts
+++ b/backend/src/routes/chunkedUpload.ts
@@ -6,6 +6,7 @@ import { pipeline } from 'stream/promises';
 import { query } from '../db/index.js';
 import { generateThumbnail, getImageDimensions, generateMediaPreview } from '../utils/thumbnail.js';
 import { storageManager } from '../services/storage.js';
+import { assertActiveStorageWritable, isStorageCooldownError, sendStorageCooldownHttpError } from '../services/storageCooldownGuard.js';
 import { getSignedUrl } from '../middleware/signedUrl.js';
 import { getUniqueStoredName } from '../utils/fileUtils.js';
 import { buildStorageFolderWithRules, getStoragePathRules } from '../utils/storagePath.js';
@@ -321,6 +322,7 @@ router.post('/complete', async (req: Request, res: Response) => {
         let width = null;
         let height = null;
         const provider = storageManager.getProvider();
+        await assertActiveStorageWritable();
 
         if (provider.name === 'local' && (session.mimeType.startsWith('image/') || session.mimeType.startsWith('video/'))) {
             try {
@@ -412,6 +414,9 @@ router.post('/complete', async (req: Request, res: Response) => {
         });
     } catch (error) {
         console.error('完成上传失败:', error);
+        if (isStorageCooldownError(error)) {
+            return sendStorageCooldownHttpError(res, error);
+        }
         res.status(500).json({ error: '完成上传失败' });
     }
 });
diff --git a/backend/src/routes/upload.ts b/backend/src/routes/upload.ts
index c568c4a..6b19b72 100644
--- a/backend/src/routes/upload.ts
+++ b/backend/src/routes/upload.ts
@@ -8,6 +8,7 @@ import { query } from '../db/index.js';
 import { validateApiKey } from '../middleware/apiKey.js';
 import { generateThumbnail, getImageDimensions, generateMediaPreview } from '../utils/thumbnail.js';
 import { storageManager } from '../services/storage.js';
+import { assertActiveStorageWritable, isStorageCooldownError, sendStorageCooldownHttpError } from '../services/storageCooldownGuard.js';
 import { getSignedUrl } from '../middleware/signedUrl.js';
 import { getUniqueStoredName } from '../utils/fileUtils.js';
 import { buildStorageFolderWithRules, getStoragePathRules } from '../utils/storagePath.js';
@@ -97,6 +98,7 @@ const handleUpload = async (req: Request, res: Response, source: string = 'web')
     try {
         // 1. 获取当前存储提供商
         const provider = storageManager.getProvider();
+        await assertActiveStorageWritable();
         console.log(`[Upload] 🛠️  Current storage provider: ${provider.name}, activeAccountId: ${activeAccountId || 'none (local)'}`);
 
         // 2. 在保存到永久存储前生成缩略图和获取尺寸
@@ -219,6 +221,9 @@ const handleUpload = async (req: Request, res: Response, source: string = 'web')
     } catch (error) {
         console.error('上传处理失败:', error);
         if (fs.existsSync(tempPath)) fs.unlinkSync(tempPath);
+        if (isStorageCooldownError(error)) {
+            return sendStorageCooldownHttpError(res, error);
+        }
         res.status(500).json({ error: '文件上传失败' });
     }
 };
diff --git a/backend/src/services/googleDriveQuotaCooldown.test.ts b/backend/src/services/googleDriveQuotaCooldown.test.ts
new file mode 100644
index 0000000..66de4ca
--- /dev/null
+++ b/backend/src/services/googleDriveQuotaCooldown.test.ts
@@ -0,0 +1,90 @@
+import assert from 'node:assert/strict';
+import { mkdtemp, writeFile, rm } from 'node:fs/promises';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { GoogleDriveStorageProvider, StorageQuotaCooldownError } from './storage.js';
+
+async function main() {
+    const tempDir = await mkdtemp(join(tmpdir(), 'tg-vault-gdrive-quota-test-'));
+    const tempFile = join(tempDir, 'upload.txt');
+    await writeFile(tempFile, 'demo');
+
+    const provider = new GoogleDriveStorageProvider(
+        'account-id',
+        'client-id',
+        'client-secret',
+        'refresh-token',
+        'http://localhost/callback'
+    );
+
+    (provider as any).oauth2Client = {
+        getAccessToken: async () => ({ token: 'access-token', res: { data: { expiry_date: Date.now() + 3600_000 } } })
+    };
+    (provider as any).drive = {
+        files: {
+            list: async () => ({ data: { files: [{ id: 'tg-vault-folder-id' }] } }),
+            create: async () => {
+                const error: any = new Error('The user has exceeded their Drive upload limit. Please try again later.');
+                error.code = 403;
+                error.response = {
+                    status: 403,
+                    data: {
+                        error: {
+                            status: 'PERMISSION_DENIED',
+                            errors: [{ reason: 'dailyLimitExceeded', message: 'The user has exceeded their Drive upload limit' }]
+                        }
+                    }
+                };
+                throw error;
+            },
+        },
+    };
+
+    try {
+        await assert.rejects(
+            () => provider.saveFile(tempFile, 'demo.txt', 'text/plain', null),
+            (error: unknown) => {
+                assert.ok(error instanceof StorageQuotaCooldownError, 'daily upload quota errors should use StorageQuotaCooldownError');
+                assert.equal((error as StorageQuotaCooldownError).provider, 'google_drive');
+                assert.equal((error as StorageQuotaCooldownError).reason, 'daily_upload_limit');
+                assert.equal((error as StorageQuotaCooldownError).storageAccountId, 'account-id');
+                assert.ok((error as StorageQuotaCooldownError).cooldownUntil.getTime() > Date.now() + 23 * 60 * 60 * 1000);
+                return true;
+            }
+        );
+
+        (provider as any).folderIdCache.clear();
+        (provider as any).drive.files.create = async () => {
+            const error: any = new Error('User rate limit exceeded');
+            error.code = 403;
+            error.response = {
+                status: 403,
+                data: {
+                    error: {
+                        status: 'RESOURCE_EXHAUSTED',
+                        errors: [{ reason: 'userRateLimitExceeded', message: 'User rate limit exceeded' }]
+                    }
+                }
+            };
+            throw error;
+        };
+
+        await assert.rejects(
+            () => provider.saveFile(tempFile, 'demo.txt', 'text/plain', null),
+            (error: unknown) => {
+                assert.ok(!(error instanceof StorageQuotaCooldownError), 'generic API rate limits must not pause uploads for 24 hours');
+                assert.match((error as Error).message, /Google Drive upload failed/);
+                return true;
+            }
+        );
+    } finally {
+        await rm(tempDir, { recursive: true, force: true });
+    }
+
+    console.log('google drive quota cooldown error ok');
+}
+
+main().catch(error => {
+    console.error(error);
+    process.exit(1);
+});
diff --git a/backend/src/services/storage.ts b/backend/src/services/storage.ts
index 86dbda2..3775323 100644
--- a/backend/src/services/storage.ts
+++ b/backend/src/services/storage.ts
@@ -18,6 +18,49 @@ import {
     isSensitiveSettingKey,
     storageConfigNeedsEncryption,
 } from '../utils/credentialCrypto.js';
+import { DEFAULT_STORAGE_COOLDOWN_MS, STORAGE_COOLDOWN_REASON_DAILY_UPLOAD_LIMIT } from './storageCooldown.js';
+
+export class StorageQuotaCooldownError extends Error {
+    provider: string;
+    reason: string;
+    storageAccountId?: string;
+    cooldownUntil: Date;
+    originalError?: unknown;
+
+    constructor(message: string, options: { provider: string; reason: string; storageAccountId?: string; cooldownUntil?: Date; originalError?: unknown }) {
+        super(message);
+        this.name = 'StorageQuotaCooldownError';
+        this.provider = options.provider;
+        this.reason = options.reason;
+        this.storageAccountId = options.storageAccountId;
+        this.cooldownUntil = options.cooldownUntil || new Date(Date.now() + DEFAULT_STORAGE_COOLDOWN_MS);
+        this.originalError = options.originalError;
+    }
+}
+
+export function isStorageQuotaCooldownError(error: unknown): error is StorageQuotaCooldownError {
+    return error instanceof StorageQuotaCooldownError || (error as any)?.name === 'StorageQuotaCooldownError';
+}
+
+function googleDriveErrorText(error: any): string {
+    const pieces = [
+        error?.message,
+        error?.errorMessage,
+        error?.response?.data ? JSON.stringify(error.response.data) : undefined,
+        error?.errors ? JSON.stringify(error.errors) : undefined,
+    ].filter(Boolean);
+    return pieces.join(' ');
+}
+
+function isGoogleDriveDailyUploadLimitError(error: any): boolean {
+    const status = Number(error?.code || error?.response?.status || error?.status || 0);
+    const text = googleDriveErrorText(error);
+    if (status !== 403) return false;
+    // Treat only explicit Drive/upload-limit responses as the 24h daily upload cap.
+    // Generic userRateLimitExceeded/rateLimitExceeded/429 errors are usually short-lived API throttles
+    // and must not pause background transfers for a full day.
+    return /Drive upload limit|exceeded their Drive upload limit|exceeded.*upload limit|upload limit exceeded|upload limit/i.test(text);
+}
 
 // 接口定义
 export interface IStorageProvider {
@@ -1050,6 +1093,14 @@ export class GoogleDriveStorageProvider implements IStorageProvider {
             return file.data.id;
         } catch (error: any) {
             console.error('[GoogleDrive] Upload failed:', error.message);
+            if (isGoogleDriveDailyUploadLimitError(error)) {
+                throw new StorageQuotaCooldownError('Google Drive 今日上传额度已达上限，任务将自动暂停 24 小时后继续。', {
+                    provider: 'google_drive',
+                    reason: STORAGE_COOLDOWN_REASON_DAILY_UPLOAD_LIMIT,
+                    storageAccountId: this.id,
+                    originalError: error,
+                });
+            }
             throw new Error(`Google Drive upload failed: ${error.message}`);
         }
     }
diff --git a/backend/src/services/storageCooldown.ts b/backend/src/services/storageCooldown.ts
new file mode 100644
index 0000000..2bfc804
--- /dev/null
+++ b/backend/src/services/storageCooldown.ts
@@ -0,0 +1,85 @@
+import { query } from '../db/index.js';
+
+export const STORAGE_COOLDOWN_REASON_DAILY_UPLOAD_LIMIT = 'daily_upload_limit';
+export const DEFAULT_STORAGE_COOLDOWN_MS = 24 * 60 * 60 * 1000;
+
+export interface StorageAccountCooldown {
+    storageAccountId: string;
+    provider: string;
+    reason: string;
+    cooldownUntil: Date;
+    lastError?: string | null;
+}
+
+export async function ensureStorageCooldownSchema(): Promise<void> {
+    await query(`
+        CREATE TABLE IF NOT EXISTS storage_account_cooldowns (
+            id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+            storage_account_id UUID REFERENCES storage_accounts(id) ON DELETE CASCADE,
+            provider VARCHAR(50) NOT NULL,
+            reason VARCHAR(100) NOT NULL,
+            cooldown_until TIMESTAMPTZ NOT NULL,
+            last_error TEXT,
+            created_at TIMESTAMPTZ DEFAULT NOW(),
+            updated_at TIMESTAMPTZ DEFAULT NOW(),
+            UNIQUE(storage_account_id, provider, reason)
+        )
+    `);
+    await query(`CREATE INDEX IF NOT EXISTS idx_storage_account_cooldowns_until ON storage_account_cooldowns(cooldown_until)`);
+}
+
+export async function markStorageAccountCooldown(
+    storageAccountId: string | null | undefined,
+    provider: string,
+    reason: string,
+    cooldownUntil: Date,
+    error?: string | null,
+): Promise<void> {
+    if (!storageAccountId) return;
+    await ensureStorageCooldownSchema();
+    await query(
+        `INSERT INTO storage_account_cooldowns (storage_account_id, provider, reason, cooldown_until, last_error, updated_at)
+         VALUES ($1, $2, $3, $4, $5, NOW())
+         ON CONFLICT (storage_account_id, provider, reason)
+         DO UPDATE SET cooldown_until = EXCLUDED.cooldown_until, last_error = EXCLUDED.last_error, updated_at = NOW()`,
+        [storageAccountId, provider, reason, cooldownUntil, error || null],
+    );
+}
+
+export async function getStorageAccountCooldown(
+    storageAccountId: string | null | undefined,
+    provider: string,
+    reason = STORAGE_COOLDOWN_REASON_DAILY_UPLOAD_LIMIT,
+): Promise<StorageAccountCooldown | null> {
+    if (!storageAccountId) return null;
+    await ensureStorageCooldownSchema();
+    const result = await query(
+        `SELECT storage_account_id, provider, reason, cooldown_until, last_error
+         FROM storage_account_cooldowns
+         WHERE storage_account_id = $1
+           AND provider = $2
+           AND reason = $3
+           AND cooldown_until > NOW()
+         LIMIT 1`,
+        [storageAccountId, provider, reason],
+    );
+    const row = result.rows[0];
+    if (!row) return null;
+    return {
+        storageAccountId: row.storage_account_id,
+        provider: row.provider,
+        reason: row.reason,
+        cooldownUntil: new Date(row.cooldown_until),
+        lastError: row.last_error,
+    };
+}
+
+export async function isStorageAccountCooling(storageAccountId: string | null | undefined, provider: string): Promise<boolean> {
+    return Boolean(await getStorageAccountCooldown(storageAccountId, provider));
+}
+
+export async function clearExpiredStorageCooldowns(): Promise<number> {
+    await ensureStorageCooldownSchema();
+    const result = await query(`DELETE FROM storage_account_cooldowns WHERE cooldown_until <= NOW()`);
+    return result.rowCount || 0;
+}
diff --git a/backend/src/services/storageCooldownGuard.test.ts b/backend/src/services/storageCooldownGuard.test.ts
new file mode 100644
index 0000000..9d3a751
--- /dev/null
+++ b/backend/src/services/storageCooldownGuard.test.ts
@@ -0,0 +1,34 @@
+import assert from 'node:assert/strict';
+import { StorageQuotaCooldownError } from './storage.js';
+import { buildStorageCooldownHttpError, formatStorageCooldownNotice } from './storageCooldownGuard.js';
+
+async function main() {
+    const cooldownUntil = new Date('2030-01-02T03:04:05.000Z');
+    const error = new StorageQuotaCooldownError('Google Drive 今日上传额度已达上限，任务将自动暂停 24 小时后继续。', {
+        provider: 'google_drive',
+        reason: 'daily_upload_limit',
+        storageAccountId: 'account-id',
+        cooldownUntil,
+    });
+
+    const payload = buildStorageCooldownHttpError(error);
+    assert.equal(payload.status, 429);
+    assert.equal(payload.body.code, 'storage_account_cooling');
+    assert.equal(payload.body.provider, 'google_drive');
+    assert.equal(payload.body.reason, 'daily_upload_limit');
+    assert.equal(payload.body.retryAt, cooldownUntil.toISOString());
+    assert.match(payload.body.error, /Google Drive/);
+    assert.match(payload.body.error, /24 小时/);
+
+    const notice = formatStorageCooldownNotice(cooldownUntil);
+    assert.match(notice, /Google Drive 今日上传额度已达上限/);
+    assert.match(notice, /2030-01-02T03:04:05.000Z/);
+    assert.match(notice, /剩余文件不会丢失/);
+
+    console.log('storage cooldown guard formatting ok');
+}
+
+main().catch(error => {
+    console.error(error);
+    process.exit(1);
+});
diff --git a/backend/src/services/storageCooldownGuard.ts b/backend/src/services/storageCooldownGuard.ts
new file mode 100644
index 0000000..e85850b
--- /dev/null
+++ b/backend/src/services/storageCooldownGuard.ts
@@ -0,0 +1,66 @@
+import { Response } from 'express';
+import { storageManager, StorageQuotaCooldownError, isStorageQuotaCooldownError } from './storage.js';
+import {
+    getStorageAccountCooldown,
+    STORAGE_COOLDOWN_REASON_DAILY_UPLOAD_LIMIT,
+    type StorageAccountCooldown,
+} from './storageCooldown.js';
+
+export interface StorageCooldownHttpErrorBody {
+    error: string;
+    code: 'storage_account_cooling';
+    provider: string;
+    reason: string;
+    retryAt: string;
+}
+
+export function formatStorageCooldownNotice(cooldownUntil: Date): string {
+    return [
+        '⏸️ Google Drive 今日上传额度已达上限',
+        '',
+        '当前任务已自动暂停，预计 24 小时后继续。',
+        '剩余文件不会丢失，恢复后会从未完成部分继续处理。',
+        '',
+        `恢复时间：${cooldownUntil.toISOString()}`,
+    ].join('\n');
+}
+
+export function buildStorageCooldownHttpError(error: StorageQuotaCooldownError): { status: number; body: StorageCooldownHttpErrorBody } {
+    return {
+        status: 429,
+        body: {
+            error: error.message || 'Google Drive 今日上传额度已达上限，请稍后重试。',
+            code: 'storage_account_cooling',
+            provider: error.provider,
+            reason: error.reason,
+            retryAt: error.cooldownUntil.toISOString(),
+        },
+    };
+}
+
+export function sendStorageCooldownHttpError(res: Response, error: StorageQuotaCooldownError): void {
+    const payload = buildStorageCooldownHttpError(error);
+    res.status(payload.status).json(payload.body);
+}
+
+export async function getActiveStorageCooldown(): Promise<StorageAccountCooldown | null> {
+    const provider = storageManager.getProvider();
+    const activeAccountId = storageManager.getActiveAccountId();
+    if (provider.name !== 'google_drive' || !activeAccountId) return null;
+    return getStorageAccountCooldown(activeAccountId, provider.name, STORAGE_COOLDOWN_REASON_DAILY_UPLOAD_LIMIT);
+}
+
+export async function assertActiveStorageWritable(): Promise<void> {
+    const cooldown = await getActiveStorageCooldown();
+    if (!cooldown) return;
+    throw new StorageQuotaCooldownError('Google Drive 今日上传额度已达上限，请等待自动恢复后再上传，或临时切换其它存储源。', {
+        provider: cooldown.provider,
+        reason: cooldown.reason,
+        storageAccountId: cooldown.storageAccountId,
+        cooldownUntil: cooldown.cooldownUntil,
+    });
+}
+
+export function isStorageCooldownError(error: unknown): error is StorageQuotaCooldownError {
+    return isStorageQuotaCooldownError(error);
+}
diff --git a/backend/src/services/telegramBot.ts b/backend/src/services/telegramBot.ts
index 2e30f09..2045849 100644
--- a/backend/src/services/telegramBot.ts
+++ b/backend/src/services/telegramBot.ts
@@ -302,7 +302,15 @@ interface TelegramDownloadScanSummary {
 async function updateJobProgressMessage(statusMessage: Api.Message, summary: TelegramJobProgressSummary): Promise<void> {
     const totalDone = summary.completed + summary.failed + summary.skipped;
     const lines = [
-        summary.status === 'paused' ? `⏸️ **频道下载已暂停**` : summary.status === 'cancelled' ? `🛑 **频道下载已取消**` : totalDone >= summary.totalMediaFound && summary.scanStatus === 'done' ? `✅ **频道任务完成**` : `🔎 **频道任务运行中**`,
+        summary.status === 'paused'
+            ? `⏸️ **频道下载已暂停**`
+            : summary.status === 'cooling'
+                ? `⏸️ **Google Drive 限额冷却中**`
+                : summary.status === 'cancelled'
+                    ? `🛑 **频道下载已取消**`
+                    : totalDone >= summary.totalMediaFound && summary.scanStatus === 'done'
+                        ? `✅ **频道任务完成**`
+                        : `🔎 **频道任务运行中**`,
         `🆔 job: ${summary.jobId.slice(0, 8)}`,
         `📍 频道：${summary.source}`,
         ``,
@@ -312,7 +320,11 @@ async function updateJobProgressMessage(statusMessage: Api.Message, summary: Tel
         ``,
         `⬇️ 下载：${summary.downloadStatus}`,
         `✅ 成功 ${summary.completed}　⏳ 待下载 ${summary.pending}　🔄 下载中 ${summary.downloading}　❌ 失败 ${summary.failed}　⏭ 跳过 ${summary.skipped}`,
-        summary.cooldownUntil ? `⏳ FloodWait 冷却到：${summary.cooldownUntil}` : '',
+        summary.cooldownUntil
+            ? (summary.status === 'cooling'
+                ? `⏸️ Google Drive 限额冷却到：${summary.cooldownUntil}`
+                : `⏳ FloodWait 冷却到：${summary.cooldownUntil}`)
+            : '',
         ``,
         `控制：/task_pause ${summary.jobId.slice(0, 8)} · /task_resume ${summary.jobId.slice(0, 8)} · /task_cancel ${summary.jobId.slice(0, 8)}`,
     ].filter(Boolean);
diff --git a/backend/src/services/telegramChannelJobs.ts b/backend/src/services/telegramChannelJobs.ts
index d5d4f3f..0293f92 100644
--- a/backend/src/services/telegramChannelJobs.ts
+++ b/backend/src/services/telegramChannelJobs.ts
@@ -1,7 +1,15 @@
 import { Api, TelegramClient } from 'telegram';
 import { getPeerId } from 'telegram/Utils.js';
 import { query } from '../db/index.js';
-import { storageManager } from './storage.js';
+import { storageManager, isStorageQuotaCooldownError } from './storage.js';
+import { formatStorageCooldownNotice } from './storageCooldownGuard.js';
+import {
+    clearExpiredStorageCooldowns,
+    getStorageAccountCooldown,
+    markStorageAccountCooldown,
+    STORAGE_COOLDOWN_REASON_DAILY_UPLOAD_LIMIT,
+    type StorageAccountCooldown,
+} from './storageCooldown.js';
 import { getTelegramUserClient, isTelegramUserClientReady } from './telegramUserClient.js';
 import { downloadTelegramChannelRange, getTelegramDownloadPreview, type TelegramDownloadMessageRef } from './telegramUpload.js';
 import { getSetting } from '../utils/settings.js';
@@ -685,12 +693,68 @@ function isFloodWait(error: unknown): { seconds: number } | null {
     return null;
 }
 
-async function ensureJobCanRun(jobId: string): Promise<'run' | 'paused' | 'cancelled' | 'cooldown'> {
+type TelegramJobControlState = 'run' | 'paused' | 'cancelled' | 'cooldown';
+
+async function putJobIntoStorageCooldown(jobId: string, cooldownUntil: Date, reasonText: string): Promise<void> {
+    await updateJob(jobId, {
+        status: 'cooling',
+        download_status: 'cooling',
+        cooldown_until: cooldownUntil,
+        error: reasonText,
+    });
+    await query(
+        `UPDATE telegram_download_items
+         SET status = 'pending', locked_at = NULL, last_error = $2, updated_at = NOW()
+         WHERE job_id = $1
+           AND status = 'downloading'`,
+        [jobId, reasonText],
+    );
+}
+
+async function applyStorageCooldownIfNeeded(jobId: string): Promise<StorageAccountCooldown | null> {
+    const provider = storageManager.getProvider();
+    const activeAccountId = storageManager.getActiveAccountId();
+    if (provider.name !== 'google_drive' || !activeAccountId) return null;
+    const cooldown = await getStorageAccountCooldown(activeAccountId, provider.name, STORAGE_COOLDOWN_REASON_DAILY_UPLOAD_LIMIT);
+    if (!cooldown) return null;
+    await putJobIntoStorageCooldown(jobId, cooldown.cooldownUntil, `Google Drive 今日上传额度已达上限，自动暂停到 ${cooldown.cooldownUntil.toISOString()}`);
+    return cooldown;
+}
+
+async function notifyStorageCooldownOnce(botClient: TelegramClient, job: any, cooldownUntil: Date): Promise<void> {
+    const params = job.params || {};
+    if (params.storageQuotaNoticeSentAt) return;
+    const nextParams = { ...params, storageQuotaNoticeSentAt: new Date().toISOString(), storageQuotaCooldownUntil: cooldownUntil.toISOString() };
+    await updateJob(job.id, { params: JSON.stringify(nextParams) });
+    const targetChat = job.chat_id || job.user_id;
+    await botClient.sendMessage(targetChat, {
+        message: [
+            formatStorageCooldownNotice(cooldownUntil),
+            '',
+            `任务：${String(job.id).slice(0, 8)}`,
+        ].join('\n'),
+    }).catch(() => undefined);
+}
+
+async function handleStorageQuotaCooldownError(botClient: TelegramClient, jobId: string, error: unknown): Promise<boolean> {
+    if (!isStorageQuotaCooldownError(error)) return false;
+    const cooldownUntil = error.cooldownUntil;
+    await markStorageAccountCooldown(error.storageAccountId || storageManager.getActiveAccountId(), error.provider, error.reason, cooldownUntil, error.message);
+    await putJobIntoStorageCooldown(jobId, cooldownUntil, error.message);
+    const job = await getJob(jobId);
+    if (job) await notifyStorageCooldownOnce(botClient, job, cooldownUntil);
+    return true;
+}
+
+async function ensureJobCanRun(jobId: string): Promise<TelegramJobControlState> {
     const job = await getJob(jobId);
     if (!job) return 'cancelled';
     if (job.cancelled_at || job.status === 'cancelled') return 'cancelled';
     if (job.paused_at || job.status === 'paused') return 'paused';
     if (job.cooldown_until && new Date(job.cooldown_until).getTime() > Date.now()) return 'cooldown';
+    if (job.status === 'cooling' && (!job.cooldown_until || new Date(job.cooldown_until).getTime() <= Date.now())) return 'run';
+    const storageCooldown = await applyStorageCooldownIfNeeded(jobId);
+    if (storageCooldown) return 'cooldown';
     return 'run';
 }
 
@@ -750,6 +814,9 @@ async function downloadClaimedRefs(botClient: TelegramClient, requestMessage: Ap
             for (const ref of refs) await markDownloadRefStatus(jobId, ref, 'failed', `FloodWait ${flood.seconds}s`);
             return { found: 0, skipped: 0, failed: refs.length, successful: 0 };
         }
+        if (await handleStorageQuotaCooldownError(botClient, jobId, error)) {
+            return { found: 0, skipped: 0, failed: 0, successful: 0 };
+        }
         for (const ref of refs) await markDownloadRefStatus(jobId, ref, 'failed', error instanceof Error ? error.message : String(error));
         throw error;
     }
@@ -998,7 +1065,7 @@ export async function listTelegramActiveTaskQueues(userId: number, limit = 10) {
                    )
                )
                OR (
-                   j.status = 'paused'
+                   j.status IN ('paused', 'cooling')
                    AND (COALESCE(s.pending_count, 0) > 0 OR COALESCE(s.downloading_count, 0) > 0 OR j.scan_status = 'scanning')
                )
            )
@@ -1122,6 +1189,11 @@ async function runSubscriptionScan(botClient: TelegramClient) {
                 .filter((ref): ref is TelegramDownloadMessageRef => Boolean(ref));
             await markDownloadRefsDownloading(jobId, subscriptionRefs);
             const downloadResult = await downloadTelegramChannelRange(botClient, requestMessage, row.source, 0, ids.length, 'newer', ids, row.folder_override || null, subscriptionRefs, (ref, status, error) => markDownloadRefStatus(jobId, ref, status, error));
+            const cooledJob = await getJob(jobId);
+            if (cooledJob?.status === 'cooling') {
+                await notifyStorageCooldownOnce(botClient, cooledJob, new Date(cooledJob.cooldown_until));
+                continue;
+            }
             await updateJob(jobId, {
                 status: downloadResult.failed > 0 ? 'completed_with_errors' : 'completed',
                 enqueued_count: downloadResult.found,
@@ -1201,6 +1273,11 @@ async function recoverTelegramJob(botClient: TelegramClient, job: any): Promise<
             refs,
             (ref, status, error) => markDownloadRefStatus(job.id, ref, status, error),
         );
+        const cooledJob = await getJob(job.id);
+        if (cooledJob?.status === 'cooling') {
+            await notifyStorageCooldownOnce(botClient, cooledJob, new Date(cooledJob.cooldown_until));
+            return;
+        }
         await updateJob(job.id, {
             status: result.failed > 0 ? 'completed_with_errors' : 'completed',
             enqueued_count: result.found,
@@ -1221,6 +1298,16 @@ export async function recoverInterruptedTelegramJobs(botClient: TelegramClient):
     if (recoveryRunning) return;
     recoveryRunning = true;
     try {
+        await clearExpiredStorageCooldowns();
+        await query(
+            `UPDATE telegram_background_jobs
+             SET status = 'running', download_status = 'active', cooldown_until = NULL, error = NULL, updated_at = NOW()
+             WHERE status = 'cooling'
+               AND cooldown_until IS NOT NULL
+               AND cooldown_until <= NOW()
+               AND cancelled_at IS NULL
+               AND finished_at IS NULL`
+        );
         await query(
             `UPDATE telegram_download_items
              SET status = 'pending', locked_at = NULL, updated_at = NOW()
@@ -1234,7 +1321,7 @@ export async function recoverInterruptedTelegramJobs(botClient: TelegramClient):
              WHERE j.kind IN ('date_range', 'tag_download')
                AND j.finished_at IS NULL
                AND j.cancelled_at IS NULL
-               AND j.status IN ('pending', 'running', 'failed', 'completed_with_errors')
+               AND j.status IN ('pending', 'running', 'failed', 'completed_with_errors', 'cooling')
                AND i.status = 'pending'
              ORDER BY j.created_at ASC
              LIMIT 5`
diff --git a/backend/src/services/telegramUpload.ts b/backend/src/services/telegramUpload.ts
index f22daf3..304ba5f 100644
--- a/backend/src/services/telegramUpload.ts
+++ b/backend/src/services/telegramUpload.ts
@@ -6,7 +6,9 @@ import crypto from 'crypto';
 import bigInt from 'big-integer';
 import { query } from '../db/index.js';
 import { generateThumbnail, getImageDimensions } from '../utils/thumbnail.js';
-import { storageManager } from '../services/storage.js';
+import { storageManager, isStorageQuotaCooldownError, StorageQuotaCooldownError } from '../services/storage.js';
+import { assertActiveStorageWritable, formatStorageCooldownNotice } from './storageCooldownGuard.js';
+import { markStorageAccountCooldown } from './storageCooldown.js';
 import { getTelegramUserClient, isTelegramUserClientReady } from './telegramUserClient.js';
 import { getSetting } from '../utils/settings.js';
 import { isAuthenticatedAsync } from './telegramState.js';
@@ -1241,6 +1243,7 @@ interface FileUploadItem {
     size?: number;
     fileType?: string;
     error?: string;
+    storageCooldownUntil?: Date;
     retried?: boolean;           // 是否已重试过
     targetDir?: string;          // 批量上传时文件的目标目录
     folderOverride?: string | null; // 任务级保存目录覆盖，不影响全局路径规则
@@ -1415,6 +1418,7 @@ async function processFileUpload(client: TelegramClient, file: FileUploadItem, q
 
         try {
             const activeAccountId = storageManager.getActiveAccountId();
+            await assertActiveStorageWritable();
             const chatName = await getTelegramChatName(file.message);
             const batchFolder = null;
             const storageRules = await getStoragePathRules();
@@ -1510,7 +1514,13 @@ async function processFileUpload(client: TelegramClient, file: FileUploadItem, q
 
         } catch (error) {
             console.error('🤖 文件上传失败:', error);
-            file.error = (error as Error).message;
+            if (isStorageQuotaCooldownError(error)) {
+                await markStorageAccountCooldown(error.storageAccountId || storageManager.getActiveAccountId(), error.provider, error.reason, error.cooldownUntil, error.message);
+                file.storageCooldownUntil = error.cooldownUntil;
+                file.error = formatStorageCooldownNotice(error.cooldownUntil);
+            } else {
+                file.error = (error as Error).message;
+            }
             // 立即清理本地临时文件
             if (localFilePath && fs.existsSync(localFilePath)) {
                 try {
@@ -1531,7 +1541,7 @@ async function processFileUpload(client: TelegramClient, file: FileUploadItem, q
 
         const firstAttemptSuccess = await attemptUpload(signal);
 
-        if (!firstAttemptSuccess && !signal.aborted && !file.retried) {
+        if (!firstAttemptSuccess && !signal.aborted && !file.retried && !file.storageCooldownUntil) {
             file.retried = true;
             file.status = 'uploading'; // 保持 uploading 状态供外部显示
             file.error = undefined;
@@ -2037,6 +2047,13 @@ export async function downloadTelegramChannelRange(
                     successful += 1;
                     successfulMessageIds.push(item.id);
                     await onItemSettled?.(item, 'success');
+                } else if (uploadItem.storageCooldownUntil) {
+                    throw new StorageQuotaCooldownError(uploadItem.error || 'Google Drive 今日上传额度已达上限，任务将自动暂停 24 小时后继续。', {
+                        provider: 'google_drive',
+                        reason: 'daily_upload_limit',
+                        storageAccountId: storageManager.getActiveAccountId() || undefined,
+                        cooldownUntil: uploadItem.storageCooldownUntil,
+                    });
                 } else {
                     failed += 1;
                     failedMessageIds.push(item.id);
diff --git a/backend/src/services/ytDlpDownload.ts b/backend/src/services/ytDlpDownload.ts
index edde847..a8bdca7 100644
--- a/backend/src/services/ytDlpDownload.ts
+++ b/backend/src/services/ytDlpDownload.ts
@@ -4,7 +4,9 @@ import path from 'path';
 import { spawn } from 'child_process';
 import os from 'os';
 import { query } from '../db/index.js';
-import { storageManager } from './storage.js';
+import { storageManager, isStorageQuotaCooldownError } from './storage.js';
+import { assertActiveStorageWritable, formatStorageCooldownNotice } from './storageCooldownGuard.js';
+import { markStorageAccountCooldown } from './storageCooldown.js';
 import { formatBytes, getFileType, getMimeTypeFromFilename, sanitizeFilename } from '../utils/telegramUtils.js';
 import { generateThumbnail, getImageDimensions } from '../utils/thumbnail.js';
 import { getUniqueStoredName } from '../utils/fileUtils.js';
@@ -136,6 +138,7 @@ async function runYtDlpDownload(url: string, taskDir: string): Promise<void> {
 async function uploadDownloadedFile(localFilePath: string, originalFileName: string): Promise<{ finalPath: string; providerName: string; size: number; storedName: string; folder: string }> {
     const provider = storageManager.getProvider();
     const activeAccountId = storageManager.getActiveAccountId();
+    await assertActiveStorageWritable();
 
     const safeName = sanitizeFilename(originalFileName);
     const ext = path.extname(safeName) || path.extname(localFilePath) || '';
@@ -226,11 +229,22 @@ export async function handleYtDlpCommand(message: Api.Message, url: string): Pro
             task.finishedAt = Date.now();
             task.error = (e instanceof Error) ? e.message : String(e);
 
-            const errText = (task.error || '未知错误').toString().trim();
-            const trimmed = errText.length > 1500 ? errText.slice(0, 1500) + '...' : errText;
+            let replyText: string;
+            if (isStorageQuotaCooldownError(e)) {
+                await markStorageAccountCooldown(e.storageAccountId || storageManager.getActiveAccountId(), e.provider, e.reason, e.cooldownUntil, e.message);
+                replyText = [
+                    formatStorageCooldownNotice(e.cooldownUntil),
+                    '',
+                    'yt-dlp 任务没有持久化恢复队列；请在恢复时间后重新发送该链接，或先切换其它存储源。',
+                ].join('\n');
+            } else {
+                const errText = (task.error || '未知错误').toString().trim();
+                const trimmed = errText.length > 1500 ? errText.slice(0, 1500) + '...' : errText;
+                replyText = `❌ 下载/上传失败\n\n原因: ${trimmed}`;
+            }
 
             try {
-                await message.reply({ message: `❌ 下载/上传失败\n\n原因: ${trimmed}` });
+                await message.reply({ message: replyText });
             } catch {
             }
         } finally {