Most Backup programs don't let you write directly to a CD. Some of those that do won't work if you need to backup more than a CD's worth of data (600MB) Does anyone know of a good program?
There is an application called Genie Backup Manager which will span CDs and has compression both of which will help you.
To backup directly to CD you need some other software which can do what is called "packet writing". This is a technique which allows CDs to work exactly like floppies do. Roxio have a utility called Drag-To-Disk.
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Try fixfault.com to fix backup.