先作备份吧！

Make a Backup!

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在i之后跟着一个扩展名将使用该扩展名对已编辑的文件作备份。

Following the I with an extension will make a backup of the edited file using that extension.

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为防止资料因意外而遗失，应经常把资料在多种储存媒体（如 CD或DVD）上作备份。

To protect against accidental data loss, you should backup your data frequently on more than one type of storage media such as CD-R, DVD-R.

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