diff --git a/src/renderer/src/pages/settings/DataSettings/NutstoreSettings.tsx b/src/renderer/src/pages/settings/DataSettings/NutstoreSettings.tsx
index c5ac8ccd45..13087359e3 100644
--- a/src/renderer/src/pages/settings/DataSettings/NutstoreSettings.tsx
+++ b/src/renderer/src/pages/settings/DataSettings/NutstoreSettings.tsx
@@ -17,6 +17,7 @@ import {
 import { useAppDispatch, useAppSelector } from '@renderer/store'
 import {
   setNutstoreAutoSync,
+  setNutstoreMaxBackups,
   setNutstorePath,
   setNutstoreSkipBackupFile,
   setNutstoreSyncInterval,
@@ -41,7 +42,8 @@ const NutstoreSettings: FC = () => {
     nutstoreSyncInterval,
     nutstoreAutoSync,
     nutstoreSyncState,
-    nutstoreSkipBackupFile
+    nutstoreSkipBackupFile,
+    nutstoreMaxBackups
   } = useAppSelector((state) => state.nutstore)
 
   const dispatch = useAppDispatch()
@@ -143,6 +145,10 @@ const NutstoreSettings: FC = () => {
     dispatch(setNutstoreSkipBackupFile(value))
   }
 
+  const onMaxBackupsChange = (value: number) => {
+    dispatch(setNutstoreMaxBackups(value))
+  }
+
   const handleClickPathChange = async () => {
     if (!nutstoreToken) {
       return
@@ -308,6 +314,25 @@ const NutstoreSettings: FC = () => {
             </>
           )}
           <SettingDivider />
+          <SettingRow>
+            <SettingRowTitle>{t('settings.data.webdav.maxBackups')}</SettingRowTitle>
+            <Selector
+              size={14}
+              value={nutstoreMaxBackups}
+              onChange={onMaxBackupsChange}
+              disabled={!nutstoreToken}
+              options={[
+                { label: t('settings.data.local.maxBackups.unlimited'), value: 0 },
+                { label: '1', value: 1 },
+                { label: '3', value: 3 },
+                { label: '5', value: 5 },
+                { label: '10', value: 10 },
+                { label: '20', value: 20 },
+                { label: '50', value: 50 }
+              ]}
+            />
+          </SettingRow>
+          <SettingDivider />
           <SettingRow>
             <SettingRowTitle>{t('settings.data.backup.skip_file_data_title')}</SettingRowTitle>
             <Switch checked={nutSkipBackupFile} onChange={onSkipBackupFilesChange} />
diff --git a/src/renderer/src/services/NutstoreService.ts b/src/renderer/src/services/NutstoreService.ts
index c613502646..40c27a2932 100644
--- a/src/renderer/src/services/NutstoreService.ts
+++ b/src/renderer/src/services/NutstoreService.ts
@@ -63,6 +63,50 @@ let syncTimeout: NodeJS.Timeout | null = null
 let isAutoBackupRunning = false
 let isManualBackupRunning = false
 
+async function cleanupOldBackups(webdavConfig: WebDavConfig, maxBackups: number): Promise<void> {
+  if (maxBackups <= 0) {
+    logger.debug('[cleanupOldBackups] Skip cleanup: maxBackups <= 0')
+    return
+  }
+
+  try {
+    const files = await window.api.backup.listWebdavFiles(webdavConfig)
+
+    if (!files || !Array.isArray(files)) {
+      logger.warn('[cleanupOldBackups] Failed to list nutstore directory contents')
+      return
+    }
+
+    const backupFiles = files
+      .filter((file) => file.fileName.startsWith('cherry-studio') && file.fileName.endsWith('.zip'))
+      .sort((a, b) => new Date(b.modifiedTime).getTime() - new Date(a.modifiedTime).getTime())
+
+    if (backupFiles.length < maxBackups) {
+      logger.info(`[cleanupOldBackups] No cleanup needed: ${backupFiles.length}/${maxBackups} backups`)
+      return
+    }
+
+    const filesToDelete = backupFiles.slice(maxBackups - 1)
+    logger.info(`[cleanupOldBackups] Deleting ${filesToDelete.length} old backup files`)
+
+    let deletedCount = 0
+    for (const file of filesToDelete) {
+      try {
+        await window.api.backup.deleteWebdavFile(file.fileName, webdavConfig)
+        deletedCount++
+      } catch (error) {
+        logger.error(`[cleanupOldBackups] Failed to delete ${file.basename}:`, error as Error)
+      }
+    }
+
+    if (deletedCount > 0) {
+      logger.info(`[cleanupOldBackups] Successfully deleted ${deletedCount} old backups`)
+    }
+  } catch (error) {
+    logger.error('[cleanupOldBackups] Error during cleanup:', error as Error)
+  }
+}
+
 export async function backupToNutstore({
   showMessage = false,
   customFileName = ''
@@ -101,7 +145,12 @@ export async function backupToNutstore({
 
   const backupData = await getBackupData()
   const skipBackupFile = store.getState().nutstore.nutstoreSkipBackupFile
+  const maxBackups = store.getState().nutstore.nutstoreMaxBackups
+
   try {
+    // 先清理旧备份
+    await cleanupOldBackups(config, maxBackups)
+
     const isSuccess = await window.api.backup.backupToWebdav(backupData, {
       ...config,
       fileName: finalFileName,
@@ -109,11 +158,7 @@ export async function backupToNutstore({
     })
 
     if (isSuccess) {
-      store.dispatch(
-        setNutstoreSyncState({
-          lastSyncError: null
-        })
-      )
+      store.dispatch(setNutstoreSyncState({ lastSyncError: null }))
       showMessage && window.message.success({ content: i18n.t('message.backup.success'), key: 'backup' })
     } else {
       store.dispatch(setNutstoreSyncState({ lastSyncError: 'Backup failed' }))
diff --git a/src/renderer/src/store/migrate.ts b/src/renderer/src/store/migrate.ts
index f5613a52a2..6e4da0f1de 100644
--- a/src/renderer/src/store/migrate.ts
+++ b/src/renderer/src/store/migrate.ts
@@ -2080,11 +2080,15 @@ const migrateConfig = {
       return state
     }
   },
-    '130': (state: RootState) => {
+  '130': (state: RootState) => {
     try {
       if (state.settings && state.settings.openAI && !state.settings.openAI.verbosity) {
         state.settings.openAI.verbosity = 'medium'
       }
+      // 为 nutstore 添加备份数量限制的默认值
+      if (state.nutstore && state.nutstore.nutstoreMaxBackups === undefined) {
+        state.nutstore.nutstoreMaxBackups = 0
+      }
       return state
     } catch (error) {
       logger.error('migrate 130 error', error as Error)
diff --git a/src/renderer/src/store/nutstore.ts b/src/renderer/src/store/nutstore.ts
index cd4721b6df..e2a05f021e 100644
--- a/src/renderer/src/store/nutstore.ts
+++ b/src/renderer/src/store/nutstore.ts
@@ -11,6 +11,7 @@ export interface NutstoreState {
   nutstoreSyncInterval: number
   nutstoreSyncState: NutstoreSyncState
   nutstoreSkipBackupFile: boolean
+  nutstoreMaxBackups: number
 }
 
 const initialState: NutstoreState = {
@@ -23,7 +24,8 @@ const initialState: NutstoreState = {
     syncing: false,
     lastSyncError: null
   },
-  nutstoreSkipBackupFile: false
+  nutstoreSkipBackupFile: false,
+  nutstoreMaxBackups: 0
 }
 
 const nutstoreSlice = createSlice({
@@ -47,6 +49,9 @@ const nutstoreSlice = createSlice({
     },
     setNutstoreSkipBackupFile: (state, action: PayloadAction<boolean>) => {
       state.nutstoreSkipBackupFile = action.payload
+    },
+    setNutstoreMaxBackups: (state, action: PayloadAction<number>) => {
+      state.nutstoreMaxBackups = action.payload
     }
   }
 })
@@ -57,7 +62,8 @@ export const {
   setNutstoreAutoSync,
   setNutstoreSyncInterval,
   setNutstoreSyncState,
-  setNutstoreSkipBackupFile
+  setNutstoreSkipBackupFile,
+  setNutstoreMaxBackups
 } = nutstoreSlice.actions
 
 export default nutstoreSlice.reducer