Optimize backup

https://github.com/2dust/v2rayN/issues/5681

v2rayN/ServiceLib/Common/FileManager.cs

@@ -143,6 +143,10 @@ namespace ServiceLib.Common
                 {
                     continue;
                 }
+                if (file.Extension == file.Name)
+                {
+                    continue;
+                }
                 string targetFilePath = Path.Combine(destinationDir, file.Name);
                 file.CopyTo(targetFilePath);
             }

v2rayN/ServiceLib/ViewModels/BackupAndRestoreViewModel.cs

@@ -147,7 +147,7 @@ namespace ServiceLib.ViewModels
             var configDirZipTemp = Utils.GetTempPath($"v2rayN_{DateTime.Now:yyyyMMddHHmmss}");
             var configDirTemp = Path.Combine(configDirZipTemp, "guiConfigs");
 
-            await Task.Run(() => FileManager.CopyDirectory(configDir, configDirTemp, true, "cache.db"));
+            await Task.Run(() => FileManager.CopyDirectory(configDir, configDirTemp, false, "cache.db"));
             var ret = await Task.Run(() => FileManager.CreateFromDirectory(configDirZipTemp, fileName));
             await Task.Run(() => Directory.Delete(configDirZipTemp, true));
             return ret;