⚡ 增加多文件备份, 尝试修复UI假死状态, 修复高分屏缩放导致的鼠标追随bug

App.config

@@ -61,7 +61,7 @@
 		</assemblyBinding>
 	</runtime>
 	<appSettings>
-		<add key="Version" value="2.5.14" />
+		<add key="Version" value="2.5.15" />
 		<add key="GitHubUrl" value="https://github.com/BookerLiu/GeekDesk" />
 		<add key="GiteeUrl" value="https://gitee.com/BookerLiu/GeekDesk/tree/master" />
 		<add key="GitHubUpdateUrl" value="https://raw.githubusercontent.com/BookerLiu/GeekDesk/master/Update.json" />
@@ -70,6 +70,7 @@
 		<add key="ClientSettingsProvider.ServiceUri" value="" />
 		<add key="CustomIconTeachUrl" value="https://mp.weixin.qq.com/s/LxoHAekho9HBVl4FRw_Law" />
 		<add key="ShowPublicWeChat" value="Y" />
+		<add key="BakDays" value="7" />
 	</appSettings>
 	<system.web>
 		<membership defaultProvider="ClientAuthenticationMembershipProvider">