But that's okay, I had a backup.
没关系，我有备份！
Just to be sure I kicked off an extra backup and once done did a test boot using the external drive to ensure I had an easy return path to Snow Leopard if things went badly wrong.
我只是要确定，我所开始的这次额外备份在其完成之后，会使用外部驱动来进行一次测试启动，这就确保了如果事情出现了严重错误的话，我会有一种很容易就返回到Snow Leopard中的手段。
In six months of using SuperMemo, I had to restore from a full backup three times, each time losing six to eight hours of work.
在六个月的使用期类，我做过三次完整恢复，每一次恢复都让我损失六到八个小时的工作。
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