How to Create an Image of Your PC Before Upgrading to Windows 10. If you have followed my advice, you are imaging your hard drive at least once a week. In the event of catastrophic failure, you can just restore the image, and be back to computing as usual. This is made more important by the uncertainty surrounding a new operating system like Windows 10. This article will show you how simple it is. It will be much faster if you have a USB 3.0 port on your computer; but, in any event, you will need a USB external drive larger than your computer's hard drive. Now, get out there and create a backup image. Don't make me come over there.