If you are backing up the existing OS via a serial link, be patient: it took approximately 15 minutes on my machine.
如果您通过一个串行链接备份现在的操作系统，请耐心：在我的机器上这需要大约15分钟。
An offline policy is applied to a machine that is used for backing up and restoring database images.
离线策略应用到用于备份和恢复数据库映像的机器。
As you can see in the screenshot, because my machine is running XP, Upgrade Advisor is recommending backing up all of the data on it, as it will require a clean install of Windows 7.
正如你在截图中看到的，由于我的机器运行的是xp，升级助手推荐我在xp中备份所有的数据，同样它也要求一个Windows 7的全新安装。
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