Before applying a TL, always create a backup of you current installation, and plan on a worst case scenario-on restoring that backup if needed to rollback the system to the previous level.
应用一个TL之前，您一定要先备份您当前的安装环境，然后要计划一个最坏的情况—在需要的时候将系统回滚到之前的版本。
The general rule of thumb is to always create a backup before beginning.
一般的经验法则是一定要在更新之前创建一个备份。
The general rule of thumb is to always create a backup before beginning.
一般的经验法则是一定要在更新之前创建一个备份。
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