As always, keep backups of all the files you change and have at least one system backup image in case the worst happens.
永远记住要备份您所修改过的所有文件，为了防止最坏的情况发生，您还需要有至少一个系统备份的映像。
A full backup — in other words, one where you copy all of the files from your system — would obviously capture everything, but it can be an expensive way of backing up your information.
完全备份，即复制系统中所有的文件，很明显这样做可以保存所有的信息，但这可能是一种代价很大的信息备份方式。
Rather than a backup having to deal with the intricacies of how the operating system is installed on your system and hardware, Linux backups are about packaging and unpackaging files.
不同于让备份必须处理操作系统如何安装到系统和硬件上的复杂细节，Linux备份处理的是文件的打包和解包。
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