支持用户分组细分的同时，还设有权限开关，管理员可选择为整个组织或某一分组设定服务权限。
Users can be grouped in subdivisions while the administrator has the option to turn the service on or off for the entire organization or for a subdivision.
p开关表示我们希望保留文件许可权限，这对良好的备份来说是很关键的。
The -p switch indicates that we want to preserve the file permissions, critical for a good backup.
这里的- f开关同样指向归档文件，- p开关表明我们想要还原归档的权限。
The -f switch again points to our file, and -p indicates that we want to restore archived permissions.
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