It has always seemed to me that a traditional CMS was a better path for creative archiving than a version control system, but that may just be me. A CMS can do things like allow you to manage a PS document while publishing it's flatter JPEG to your web site or a print image in a Quark layout. I guess if you just want to back up different version than a version control system would do just fine and is simple but a CMS can save so much time and there are plenty of good ones that are free.