Simply back up the files anywhere, and just copy over the messed up files in case you do something.Only problem i have run into is Windows not realizing it is a game and not just an app when i retransfer the game.
Not sure how DRM would react if you just move it and then move it back, have to test that
--------------------------------------------------------------------------- You look like a *****.
U can always use gamesaver (freeware) for cataloging ur installed games and making auto backup in ur savefiles with time program. (every x days)
--------------------------------------------------------------------------- -- Never ArguE witH an IdiOt he DraGs You DowN to HiS LeVeL and BeAtS yoU witH expeRience!!!