Han is right.
Back up your game cd's with CloneCD, Alcohol 120% or Blindwrite.
I like to make mine .iso or .mdf (alcohol file).
When I have enough of them, I just burn a data DVD (not an image, but a true data DVD). The DVD will have your games in .iso or what ever format you chose.
That's what I've done with mine. Works fine when you need to restore a damaged game cd.
e6400 Core 2 Duo @ 2.13ghz
GeForce 7600GT 256mb PCI-e
2gb DDR2 667mhz Patriot ram 1.8v in d/c
Gigabyte GA-965P-DS3 F10 BIOS
WD Caviar SE16 250GB SATA300 7200RPM 16MB Buffer
Samsung SATA2 80gb 7200rpm
Samsung SH-S182D 18x DVD burner