There are many different ways to back up files. Windows 7 offers a back up program on your computer, as well as hard drives, flash drives, and online backup services. What files should you back up though? Clearly, you should backup all of your documents and document folders; that’s just common sense. Music, pictures, videos, desktop email, application settings, virtual machines, and bookmarks should also be backed up. However, you don’t need to back up windows or program files because you’ll have to reinstall these items if your computer crashes anyways. For more info on this subject visit http://www.howtogeek.com/howto/30173/what-files-should-you-backup-on-your-windows-pc/.