First of all, having copies of files on the same hard drive is NOT backing up. You should get an external hard drive for this. And remember it's not backing up to just move the files to the external drive. A backup is having COPIES of files on a different drive than the original ones.
But yeah, it's possible. Although I would recommend you backed those files up before doing anything though, because the less you know about what you're doing, the more likely you are to mess things up.