开始升级之前，备份你的数据库非常重要。

It is extremely important to back up your database before beginning the upgrade.

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从你的备份中恢复数据库可以在你遇到问题时使用。

Restoring your database from backup is then possible if something goes wrong.

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为你的数据库备份。

Perform a backup of your database.

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为你的数据库备份。

Perform a backup of your database.

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