one way of creating a software backup for cds is to convert them into a .iso file and run them off of a virtual cd drive. the only problem with this option is that the .iso are an image of the cd, meaning it;s going to be close to 700mb a file. to convert your cd's into iso's use iso recorder from this website:
http://isorecorder.alexfeinman.com/isorecorder.htm
To run the .iso file on your computer there are several programs. My personal favorite is daemon tools. You can get daemon tools here:
http://www.daemon-tools.cc/dtcc/download.php