Dont get me wrong, I think Nero is a very useful backup tool, however from personal experience I would recommend PrimoDVD for DVD based games and CloneCD for CD based games. CloneCD is the only software that will create a 1:1 cd-r copy.
In a list of 1/2/3
DVD
1. PrimoDVD/RecordNow Max
2. Nero
3. Discjuggler
CD
1. CloneCD
2. CDRWin
3. Nero
eastcostguy - check out my site under the playstation page for links to burning software -
http://psxpaul.cjb.net