备份工具叫rysnc。需要事先安装好。

rsync -aAXHv   --exclude={"/dev/*","/proc/*","/sys/*","/tmp/*","/run/*","/mnt/*","/media/*","/lost+found","/back/","/home/sky/cangku/"}    / /back

结构是：命令参数不需要备份的目录需要备份目录存储目录还原的时候去掉上面第三个，对调最后的两个。

查看文件大小

du  -h   --max-depth=1

结构：命令可读形式深度为第一层