If you want to backup software/games to a DVD, there is a nice solution (at least, I think so).
First, make ISO images of your original discs. Burn these ISO images to a data DVD. If you want to use an image, simply mount it with some virtual drive program (Nero and Alchohol come with a virtual drive, or simply download the incredibly and free Daemon tools).
I did the same some time ago... works like a charm (and I always can carry my programs with my laptop, on a few DVD discs).