使用备份副本恢复数据库。
管理类由归档和备份副本组组成。
The management classes consist of archive and backup copy groups.
保存login . css文件的备份副本。
You really need that because if you have only one copy of something, you don't have a backup; so, you can store the one copy separately.
你真的很需要这项发明,因为要是你只有一份的话,你就没有备份;,这样的话,你就可以将副本单独留存。
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