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

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。

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When a block is written to the active disk, a copy of the block is also written to the backup host.

当将一个数据块写入活动磁盘时，该数据块也将写入备用主机。

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

例如：主机在NAT后并做为了备份MX主机。

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

例如：主机在NAT后并做为了备份MX主机。

youdao