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。

youdao

You can even dual boot with the original OS too, making the process easy to reverse.

你甚至可以保留原来的操作系统做双系统启动，这样出问题时容易恢复。

youdao

Not only was it easy to boot and install from the thumbdrive, it was also blindingly fast: quicker than the corresponding DVD install on my desktop machine.

从U盘启动安装不但容易，而且快得雷人：比我在台式机上用DVD安装还快。

youdao

But having a successful predecessor sitting on the board (and, as is often the case with second-act chief executives, a big shareholder to boot) cannot have made life easy for David Pottruck, who had taken over from Mr Schwab in 2003.

ECONOMIST: Second-act chief executives