Windows 7, when I create a full system back up there are three files created, I am not sure if I need all three as they take up a lot of disk space. One of the files is a small disk like icon called Dell pc folder and upon opening it I see it has all the same data as the WindowsImageBackup folder. I only need a back up of my entire system in case of a major problem with my OS so can I delete one of the folders and if so which one, the third file is just MediaID bin.