Take care as copying data such as documents, spreadsheets, photos is fine but dont expect to copy applications and find them working they do need to be installed, as they do like their dll's etc in specific places along with registre entries and you need the orginal installations disks to do that. Don't forget to back up e-mails, internet favorites, and cookies otherwise you may find your self having to remember passwords or re-register on various sites (including this one)
Even back up and restore program are not particularly useful, fine if you back up and restore from the same system/disk not so good when things are changed. Even ghost dosent help copy a crap system to restore a crap system.
So as long as you don't expect to just copy everthing including applications back from your cd's you'll be fine. In fact its a bit of a waste of time and space copying the whole of your c drive onto cd's as only the data is of any use to you i.e. exe's and dll's arent, doc's, jpg's, mp3's etc are.