i used FlashFXP, Craxtion4 and DVD Decrypter to back up my games.. I had no problem with C.S.I.. It fit on a DVD disk.. Let me know if this helps..
if it dont fit on dvd5 use a dual layer dvd or you can just delete some demos or movies and online files to shrink it down
a great site i have been to so i can find out what files to delete is http://www.maverex.net/xbox/index.php hope this info is helpful..