把HOST替换为自己的备份主机名，把SOURCE替换为希望保存的目录。

Replace host with the name of your backup host and SOURCE with the directory you want to save.

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例如：主机在NAT后并做为了备份MX主机。

Example: host behind NAT box running a backup MX host.

youdao

例如：主机在NAT后并做为了备份MX主机。

Example: host behind NAT box running a backup MX host.

youdao