I you wanna backup games you'd better use a Dvd-R (You can rip most games in CD-R by erasing the cynematics) It's better not to use CD-R on XBOX, Xbox's Dvd drive is somewhat poor.

Yo backup a game you need a modchip and a dashboard (like evox, executer2, avalaunch, unleashX, Thc Dash...) you start the xbox from that dashboard, conect PC to XBOX via FTP, rip the game to PC's HDD and, burn it in a DVD-R with nero in UDF mode, or create an iso with isocraxtion or qwix and then burn it with alcohol 120, record now max, nero or whatever you wanna use.