diff --git a/app/src/main/java/io/legado/app/help/storage/AppWebDav.kt b/app/src/main/java/io/legado/app/help/storage/AppWebDav.kt
index dc6f66aef..082e85434 100644
--- a/app/src/main/java/io/legado/app/help/storage/AppWebDav.kt
+++ b/app/src/main/java/io/legado/app/help/storage/AppWebDav.kt
@@ -40,6 +40,13 @@ object AppWebDav {
             return url
         }
 
+    private val backupFileName: String
+        get() {
+            val backupDate = SimpleDateFormat("yyyy-MM-dd", Locale.getDefault())
+                .format(Date(System.currentTimeMillis()))
+            return "backup${backupDate}.zip"
+        }
+
     @Throws(Exception::class)
     suspend fun initWebDav(): Boolean {
         val account = appCtx.getPrefString(PreferKey.webDavAccount)
@@ -105,6 +112,11 @@ object AppWebDav {
         }
     }
 
+    suspend fun hasBackUp(): Boolean {
+        val url = "${rootWebDavUrl}${backupFileName}"
+        return WebDav(url).exists()
+    }
+
     suspend fun backUpWebDav(path: String) {
         try {
             if (initWebDav() && NetworkUtils.isAvailable()) {
@@ -114,9 +126,7 @@ object AppWebDav {
                 }
                 FileUtils.deleteFile(zipFilePath)
                 if (ZipUtils.zipFiles(paths, zipFilePath)) {
-                    val backupDate = SimpleDateFormat("yyyy-MM-dd", Locale.getDefault())
-                        .format(Date(System.currentTimeMillis()))
-                    val putUrl = "${rootWebDavUrl}backup${backupDate}.zip"
+                    val putUrl = "${rootWebDavUrl}${backupFileName}"
                     WebDav(putUrl).upload(zipFilePath)
                 }
             }
diff --git a/app/src/main/java/io/legado/app/help/storage/Backup.kt b/app/src/main/java/io/legado/app/help/storage/Backup.kt
index 5ff67a0fa..2979a0c31 100644
--- a/app/src/main/java/io/legado/app/help/storage/Backup.kt
+++ b/app/src/main/java/io/legado/app/help/storage/Backup.kt
@@ -51,7 +51,9 @@ object Backup : BackupRestore() {
         val lastBackup = context.getPrefLong(PreferKey.lastBackup)
         if (lastBackup + TimeUnit.DAYS.toMillis(1) < System.currentTimeMillis()) {
             Coroutine.async {
-                backup(context, context.getPrefString(PreferKey.backupPath) ?: "", true)
+                if (!AppWebDav.hasBackUp()) {
+                    backup(context, context.getPrefString(PreferKey.backupPath) ?: "", true)
+                }
             }.onError {
                 AppLog.put("备份出错\n${it.localizedMessage}", it)
                 appCtx.toastOnUi(appCtx.getString(R.string.autobackup_fail, it.localizedMessage))
diff --git a/app/src/main/java/io/legado/app/lib/webdav/WebDav.kt b/app/src/main/java/io/legado/app/lib/webdav/WebDav.kt
index 3f4b2ab8c..55f2090f6 100644
--- a/app/src/main/java/io/legado/app/lib/webdav/WebDav.kt
+++ b/app/src/main/java/io/legado/app/lib/webdav/WebDav.kt
@@ -49,7 +49,6 @@ class WebDav(urlStr: String) {
     val path get() = url.toString()
     var displayName: String? = null
     var size: Long = 0
-    var exists = false
     var parent = ""
     var urlName = ""
     var contentType = ""
@@ -141,6 +140,13 @@ class WebDav(urlStr: String) {
         return list
     }
 
+    suspend fun exists(): Boolean {
+        val response = propFindResponse() ?: return false
+        val document = Jsoup.parse(response)
+        val elements = document.getElementsByTag("d:response")
+        return elements.isNotEmpty()
+    }
+
     /**
      * 根据自己的URL，在远程处创建对应的文件夹
      * @return 是否创建成功