Burning FreeSpace2



I’m backing up my FreeSpace2 cds. The first CD has 640MB of data in a 700MB file. The Next 2 have 700-740MB of data in a 800MB file. I was wondering on how I should go about burning these to ensure I still have usuable CDs(I do want to make usuable backups!). Should I use overburning 80min CDs. Can anyone with experience contact me?