这是一个把U盘备份到本地磁盘的软件，它对U盘和已经存放在本地磁盘的备份文件进行比对，如果文件已经更新，它就将进行备份-This is a backup to the local disk, U disk software, U disk and it has been stored on the local disk backup file to compare, if the file has been updated, it wil