Extract Specific Files from Windows System Image Backup. If you have been paying attention, you have been creating a backup image of your hard drive to a USB 3.0 external disk, and you have been doing it regularly. If not, stop reading, and go do it. Now. Okay, are you back? Good. Now, what if you just want to locate one file or a group of files? You can sync essential files using utility like GoodSync, which I also do on a regular basis. Absent that option, however, you can get individual files from a system image. This article will show you how. Be safe out there.