xbox dvd burning

[twikoff]

as I mentioned earlier.. Im considering getting an xbox

if Im going to back up games.. I guess I will need to get a dvd burner

without sacrificing data, about what percentage of games can be burnt using a cdrw?

what formats can the xbox play? cdr, cdrw, dvd-r, dvd-rw, dvd+r, dvd+rw, etc....?

I was trying to hold off for a sony DRU 500a.. but it doesnt look like the price is going to go down anytime soon.. so maybe Ill try to grab one next time there is a good deal on one.. any suggestions?