您可以使用tar来创建一个系统备份，该文件系统将压缩到一个可记录的DVD上，然而，现在大多数系统的用户数据非常庞大，一个DVD不能存下。

You may be able to use tar to create a system backup that will fit on a recordable DVD, once compressed; however, most modern systems have enough user data that a single DVD won't hold it all.

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