I remember Zedy posting something about oversized discs. I think he said something along the lines of:
1: Create a temp directory, copy everything from the original game disc to it EXCEPT the oversized files. Include that patch Rincewind is pointing you to as well if you want.
2: Install the game, now the oversized files will be of a 'decent' size.
3: Copy THESE oversized files (From the installed directory) to the temp directory.
4: Burn back to cdr/rw. Should have a working backup now.
If I'm wrong, flame me.