diff --git a/.github/scripts/cronet.sh b/.github/scripts/cronet.sh
index 2a6b865d2..aa592f3bf 100644
--- a/.github/scripts/cronet.sh
+++ b/.github/scripts/cronet.sh
@@ -1,35 +1,54 @@
 #!/usr/bin/env bash
 
+#分支Stable Dev Beta
 branch=$1
+#api 最大偏移
+max_offset=$2
+
 [ -z $1 ] && branch=Stable
+[ -z $2 ] && max_offset=3
 [ -z $GITHUB_ENV ] && echo "Error: Unexpected github workflow environment" && exit
 
-# 获取最新cronet版本
-echo "fetch $branch release info from https://chromiumdash.appspot.com ..."
-lastest_cronet_version=`curl -s "https://chromiumdash.appspot.com/fetch_releases?channel=$branch&platform=Android&num=1&offset=0" | jq .[0].version -r`
-echo "lastest_cronet_version: $lastest_cronet_version"
-#lastest_cronet_version=100.0.4845.0
-lastest_cronet_main_version=${lastest_cronet_version%%\.*}.0.0.0
-# 检查版本是否存在
+offset=0
+
+function fetchExitVersion() {
+    # 获取最新cronet版本
+    echo "fetch $branch release info from https://chromiumdash.appspot.com ..."
+    lastest_cronet_version=`curl -s "https://chromiumdash.appspot.com/fetch_releases?channel=$branch&platform=Android&num=1&offset=$offset" | jq .[0].version -r`
+    echo "lastest_cronet_version: $lastest_cronet_version"
+    #lastest_cronet_version=100.0.4845.0
+    lastest_cronet_main_version=${lastest_cronet_version%%\.*}.0.0.0
+    checkVersionExit
+}
 function checkVersionExit() {
+    # 检查版本是否存在
     local jar_url="https://storage.googleapis.com/chromium-cronet/android/$lastest_cronet_version/Release/cronet/cronet_api.jar"
     statusCode=$(curl -s -I -w %{http_code} "$jar_url" -o /dev/null)
     if [ $statusCode == "404" ];then
         echo "storage.googleapis.com return 404 for cronet $lastest_cronet_version"
-        exit
+        if [[ $max_offset > $offset ]]; then
+            offset=$(expr $offset + 1)
+            echo "retry with offset $offset"
+            fetchExitVersion
+        else
+            exit
+        fi
     fi
 }
 # 添加变量到github env
 function writeVariableToGithubEnv() {
     echo "$1=$2" >> $GITHUB_ENV
 }
+
+##########
 # 获取本地cronet版本
 path=$GITHUB_WORKSPACE/gradle.properties
 current_cronet_version=`cat $path | grep CronetVersion | sed s/CronetVersion=//`
 echo "current_cronet_version: $current_cronet_version"
 
+fetchExitVersion
+
 if [[  $current_cronet_version < $lastest_cronet_version ]];then
-    checkVersionExit
     # 更新gradle.properties
     sed -i s/CronetVersion=.*/CronetVersion=$lastest_cronet_version/ $path
     sed -i s/CronetMainVersion=.*/CronetMainVersion=$lastest_cronet_main_version/ $path
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 69a8a1884..0a008878f 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
@@ -151,13 +151,13 @@ object Backup {
             if (ZipUtils.zipFiles(paths, zipFilePath)) {
                 when {
                     path.isNullOrBlank() -> {
-                        copyBackup(context.getExternalFilesDir(null)!!, zipFileName)
+                        copyBackup(context.getExternalFilesDir(null)!!, "backup.zip")
                     }
                     path.isContentScheme() -> {
-                        copyBackup(context, Uri.parse(path), zipFileName)
+                        copyBackup(context, Uri.parse(path), "backup.zip")
                     }
                     else -> {
-                        copyBackup(File(path), zipFileName)
+                        copyBackup(File(path), "backup.zip")
                     }
                 }
                 AppWebDav.backUpWebDav(zipFileName)
@@ -175,6 +175,7 @@ object Backup {
     }
 
     @Throws(Exception::class)
+    @Suppress("SameParameterValue")
     private fun copyBackup(context: Context, uri: Uri, fileName: String) {
         DocumentFile.fromTreeUri(context, uri)?.let { treeDoc ->
             treeDoc.findFile(fileName)?.delete()
@@ -187,6 +188,7 @@ object Backup {
     }
 
     @Throws(Exception::class)
+    @Suppress("SameParameterValue")
     private fun copyBackup(rootFile: File, fileName: String) {
         FileInputStream(File(zipFilePath)).use { inputS ->
             val file = FileUtils.createFileIfNotExist(rootFile, fileName)