数据库是一堆互相连接的行和列，可以容易地进行备份、存储、查询、链接，可是，来自于文档的“数据”有着更多的信息。

You can put it in a database that can be backed up, stored, queried and linked. But the “data” comes from a document that housed much more information than you have in a database.

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您还可以将受影响的行复制到备份表，以防万一！

And yes, you might also copy the affected row to a backup table just in case!

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(还可以把脚本的最后三行嵌入一个循环，动态地修改SOURCE，从而备份同一系统上的一系列目录)。

(You can also embed the three final lines of the script in a loop, dynamically change SOURCE, and back up a series of separate directories on the same system.) Here's how the backup works.

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