diff --git a/src/renderer/src/i18n/locales/en-us.json b/src/renderer/src/i18n/locales/en-us.json
index 2ff1ce6e..60b72808 100644
--- a/src/renderer/src/i18n/locales/en-us.json
+++ b/src/renderer/src/i18n/locales/en-us.json
@@ -919,7 +919,9 @@
           "syncError": "Backup Error",
           "syncStatus": "Backup Status",
           "title": "WebDAV",
-          "user": "WebDAV User"
+          "user": "WebDAV User",
+          "maxBackups": "Maximum Backups",
+          "maxBackups.unlimited": "Unlimited"
         },
         "yuque": {
           "check": {
diff --git a/src/renderer/src/i18n/locales/ja-jp.json b/src/renderer/src/i18n/locales/ja-jp.json
index 21c7db52..528f6a21 100644
--- a/src/renderer/src/i18n/locales/ja-jp.json
+++ b/src/renderer/src/i18n/locales/ja-jp.json
@@ -919,7 +919,9 @@
           "syncError": "バックアップエラー",
           "syncStatus": "バックアップ状態",
           "title": "WebDAV",
-          "user": "WebDAVユーザー"
+          "user": "WebDAVユーザー",
+          "maxBackups": "最大バックアップ数",
+          "maxBackups.unlimited": "無制限"
         },
         "yuque": {
           "check": {
diff --git a/src/renderer/src/i18n/locales/ru-ru.json b/src/renderer/src/i18n/locales/ru-ru.json
index ad26a716..0349c617 100644
--- a/src/renderer/src/i18n/locales/ru-ru.json
+++ b/src/renderer/src/i18n/locales/ru-ru.json
@@ -919,7 +919,9 @@
           "syncError": "Ошибка резервного копирования",
           "syncStatus": "Статус резервного копирования",
           "title": "WebDAV",
-          "user": "Пользователь WebDAV"
+          "user": "Пользователь WebDAV",
+          "maxBackups": "Максимальное количество резервных копий",
+          "maxBackups.unlimited": "Без ограничений"
         },
         "yuque": {
           "check": {
diff --git a/src/renderer/src/i18n/locales/zh-cn.json b/src/renderer/src/i18n/locales/zh-cn.json
index 975bf2b1..86156aeb 100644
--- a/src/renderer/src/i18n/locales/zh-cn.json
+++ b/src/renderer/src/i18n/locales/zh-cn.json
@@ -921,7 +921,9 @@
           "syncError": "备份错误",
           "syncStatus": "备份状态",
           "title": "WebDAV",
-          "user": "WebDAV 用户名"
+          "user": "WebDAV 用户名",
+          "maxBackups": "最大备份数",
+          "maxBackups.unlimited": "无限制"
         },
         "yuque": {
           "check": {
diff --git a/src/renderer/src/i18n/locales/zh-tw.json b/src/renderer/src/i18n/locales/zh-tw.json
index 5ec1ee63..72d0ba7c 100644
--- a/src/renderer/src/i18n/locales/zh-tw.json
+++ b/src/renderer/src/i18n/locales/zh-tw.json
@@ -919,7 +919,9 @@
           "syncError": "備份錯誤",
           "syncStatus": "備份狀態",
           "title": "WebDAV",
-          "user": "WebDAV 使用者名稱"
+          "user": "WebDAV 使用者名稱",
+          "maxBackups": "最大備份數量",
+          "maxBackups.unlimited": "無限制"
         },
         "yuque": {
           "check": {
diff --git a/src/renderer/src/i18n/translate/el-gr.json b/src/renderer/src/i18n/translate/el-gr.json
index db99e7c4..7ad799f4 100644
--- a/src/renderer/src/i18n/translate/el-gr.json
+++ b/src/renderer/src/i18n/translate/el-gr.json
@@ -814,7 +814,9 @@
           "syncError": "Σφάλμα στην αντιγραφή ασφαλείας",
           "syncStatus": "Κατάσταση αντιγραφής ασφαλείας",
           "title": "WebDAV",
-          "user": "Όνομα χρήστη WebDAV"
+          "user": "Όνομα χρήστη WebDAV",
+          "maxBackups": "Μέγιστο αριθμό αρχείων αντιγραφής ασφαλείας",
+          "maxBackups.unlimited": "Απεριόριστο"
         },
         "yuque": {
           "check": {
diff --git a/src/renderer/src/i18n/translate/es-es.json b/src/renderer/src/i18n/translate/es-es.json
index cb609f66..15f6ce99 100644
--- a/src/renderer/src/i18n/translate/es-es.json
+++ b/src/renderer/src/i18n/translate/es-es.json
@@ -814,7 +814,9 @@
           "syncError": "Error de copia de seguridad",
           "syncStatus": "Estado de copia de seguridad",
           "title": "WebDAV",
-          "user": "Nombre de usuario WebDAV"
+          "user": "Nombre de usuario WebDAV",
+          "maxBackups": "Número máximo de copias de seguridad",
+          "maxBackups.unlimited": "Sin límite"
         },
         "yuque": {
           "check": {
diff --git a/src/renderer/src/i18n/translate/fr-fr.json b/src/renderer/src/i18n/translate/fr-fr.json
index 51d4ee83..d4ee58ca 100644
--- a/src/renderer/src/i18n/translate/fr-fr.json
+++ b/src/renderer/src/i18n/translate/fr-fr.json
@@ -814,7 +814,9 @@
           "syncError": "Erreur de sauvegarde",
           "syncStatus": "Statut de la sauvegarde",
           "title": "WebDAV",
-          "user": "Nom d'utilisateur WebDAV"
+          "user": "Nom d'utilisateur WebDAV",
+          "maxBackups": "Nombre maximal de sauvegardes",
+          "maxBackups.unlimited": "Illimité"
         },
         "yuque": {
           "check": {
diff --git a/src/renderer/src/i18n/translate/pt-pt.json b/src/renderer/src/i18n/translate/pt-pt.json
index d4e9a06d..9d3ccf1a 100644
--- a/src/renderer/src/i18n/translate/pt-pt.json
+++ b/src/renderer/src/i18n/translate/pt-pt.json
@@ -814,7 +814,9 @@
           "syncError": "Erro de backup",
           "syncStatus": "Status de backup",
           "title": "WebDAV",
-          "user": "Nome de usuário WebDAV"
+          "user": "Nome de usuário WebDAV",
+          "maxBackups": "Número máximo de backups",
+          "maxBackups.unlimited": "Sem limite"
         },
         "yuque": {
           "check": {
diff --git a/src/renderer/src/pages/settings/DataSettings/WebDavSettings.tsx b/src/renderer/src/pages/settings/DataSettings/WebDavSettings.tsx
index 795e5522..29221f9c 100644
--- a/src/renderer/src/pages/settings/DataSettings/WebDavSettings.tsx
+++ b/src/renderer/src/pages/settings/DataSettings/WebDavSettings.tsx
@@ -9,6 +9,7 @@ import { useAppDispatch, useAppSelector } from '@renderer/store'
 import {
   setWebdavAutoSync,
   setWebdavHost as _setWebdavHost,
+  setWebdavMaxBackups as _setWebdavMaxBackups,
   setWebdavPass as _setWebdavPass,
   setWebdavPath as _setWebdavPath,
   setWebdavSyncInterval as _setWebdavSyncInterval,
@@ -27,7 +28,8 @@ const WebDavSettings: FC = () => {
     webdavUser: webDAVUser,
     webdavPass: webDAVPass,
     webdavPath: webDAVPath,
-    webdavSyncInterval: webDAVSyncInterval
+    webdavSyncInterval: webDAVSyncInterval,
+    webdavMaxBackups: webDAVMaxBackups
   } = useSettings()
 
   const [webdavHost, setWebdavHost] = useState<string | undefined>(webDAVHost)
@@ -37,6 +39,7 @@ const WebDavSettings: FC = () => {
   const [backupManagerVisible, setBackupManagerVisible] = useState(false)
 
   const [syncInterval, setSyncInterval] = useState<number>(webDAVSyncInterval)
+  const [maxBackups, setMaxBackups] = useState<number>(webDAVMaxBackups)
 
   const dispatch = useAppDispatch()
   const { theme } = useTheme()
@@ -59,6 +62,11 @@ const WebDavSettings: FC = () => {
     }
   }
 
+  const onMaxBackupsChange = (value: number) => {
+    setMaxBackups(value)
+    dispatch(_setWebdavMaxBackups(value))
+  }
+
   const renderSyncStatus = () => {
     if (!webdavHost) return null
 
@@ -173,6 +181,19 @@ const WebDavSettings: FC = () => {
           <Select.Option value={1440}>{t('settings.data.webdav.hour_interval', { count: 24 })}</Select.Option>
         </Select>
       </SettingRow>
+      <SettingDivider />
+      <SettingRow>
+        <SettingRowTitle>{t('settings.data.webdav.maxBackups')}</SettingRowTitle>
+        <Select value={maxBackups} onChange={onMaxBackupsChange} disabled={!webdavHost} style={{ width: 120 }}>
+          <Select.Option value={0}>{t('settings.data.webdav.maxBackups.unlimited')}</Select.Option>
+          <Select.Option value={1}>1</Select.Option>
+          <Select.Option value={3}>3</Select.Option>
+          <Select.Option value={5}>5</Select.Option>
+          <Select.Option value={10}>10</Select.Option>
+          <Select.Option value={20}>20</Select.Option>
+          <Select.Option value={50}>50</Select.Option>
+        </Select>
+      </SettingRow>
       {webdavSync && syncInterval > 0 && (
         <>
           <SettingDivider />
diff --git a/src/renderer/src/services/BackupService.ts b/src/renderer/src/services/BackupService.ts
index 464346ba..753c5f0a 100644
--- a/src/renderer/src/services/BackupService.ts
+++ b/src/renderer/src/services/BackupService.ts
@@ -82,7 +82,7 @@ export async function backupToWebdav({
 
   store.dispatch(setWebDAVSyncState({ syncing: true, lastSyncError: null }))
 
-  const { webdavHost, webdavUser, webdavPass, webdavPath } = store.getState().settings
+  const { webdavHost, webdavUser, webdavPass, webdavPath, webdavMaxBackups } = store.getState().settings
   let deviceType = 'unknown'
   let hostname = 'unknown'
   try {
@@ -92,7 +92,7 @@ export async function backupToWebdav({
     Logger.error('[Backup] Failed to get device type or hostname:', error)
   }
   const timestamp = dayjs().format('YYYYMMDDHHmmss')
-  const backupFileName = customFileName || `cherry-studio.${timestamp}.${deviceType}.${hostname}.zip`
+  const backupFileName = customFileName || `cherry-studio.${timestamp}.${hostname}.${deviceType}.zip`
   const finalFileName = backupFileName.endsWith('.zip') ? backupFileName : `${backupFileName}.zip`
   const backupData = await getBackupData()
 
@@ -114,6 +114,47 @@ export async function backupToWebdav({
       if (showMessage && !autoBackupProcess) {
         window.message.success({ content: i18n.t('message.backup.success'), key: 'backup' })
       }
+
+      // 清理旧备份文件
+      if (webdavMaxBackups > 0) {
+        try {
+          // 获取所有备份文件
+          const files = await window.api.backup.listWebdavFiles({
+            webdavHost,
+            webdavUser,
+            webdavPass,
+            webdavPath
+          })
+
+          // 筛选当前设备的备份文件
+          const currentDeviceFiles = files.filter((file) => {
+            // 检查文件名是否包含当前设备的标识信息
+            return file.fileName.includes(deviceType) && file.fileName.includes(hostname)
+          })
+
+          // 如果当前设备的备份文件数量超过最大保留数量，删除最旧的文件
+          if (currentDeviceFiles.length > webdavMaxBackups) {
+            // 文件已按修改时间降序排序，所以最旧的文件在末尾
+            const filesToDelete = currentDeviceFiles.slice(webdavMaxBackups)
+
+            for (const file of filesToDelete) {
+              try {
+                await window.api.backup.deleteWebdavFile(file.fileName, {
+                  webdavHost,
+                  webdavUser,
+                  webdavPass,
+                  webdavPath
+                })
+                Logger.log(`[Backup] Deleted old backup file: ${file.fileName}`)
+              } catch (error) {
+                Logger.error(`[Backup] Failed to delete old backup file: ${file.fileName}`, error)
+              }
+            }
+          }
+        } catch (error) {
+          Logger.error('[Backup] Failed to clean up old backup files:', error)
+        }
+      }
     } else {
       // if auto backup process, throw error
       if (autoBackupProcess) {
diff --git a/src/renderer/src/store/settings.ts b/src/renderer/src/store/settings.ts
index 6ad8cfbc..f153ff69 100644
--- a/src/renderer/src/store/settings.ts
+++ b/src/renderer/src/store/settings.ts
@@ -72,6 +72,7 @@ export interface SettingsState {
   webdavPath: string
   webdavAutoSync: boolean
   webdavSyncInterval: number
+  webdavMaxBackups: number
   translateModelPrompt: string
   autoTranslateWithSpace: boolean
   enableTopicNaming: boolean
@@ -176,6 +177,7 @@ export const initialState: SettingsState = {
   webdavPath: '/cherry-studio',
   webdavAutoSync: false,
   webdavSyncInterval: 0,
+  webdavMaxBackups: 0,
   translateModelPrompt: TRANSLATE_PROMPT,
   autoTranslateWithSpace: false,
   enableTopicNaming: true,
@@ -334,6 +336,9 @@ const settingsSlice = createSlice({
     setWebdavSyncInterval: (state, action: PayloadAction<number>) => {
       state.webdavSyncInterval = action.payload
     },
+    setWebdavMaxBackups: (state, action: PayloadAction<number>) => {
+      state.webdavMaxBackups = action.payload
+    },
     setCodeShowLineNumbers: (state, action: PayloadAction<boolean>) => {
       state.codeShowLineNumbers = action.payload
     },
@@ -526,6 +531,7 @@ export const {
   setWebdavPath,
   setWebdavAutoSync,
   setWebdavSyncInterval,
+  setWebdavMaxBackups,
   setCodeShowLineNumbers,
   setCodeCollapsible,
   setCodeWrappable,