A comment I made on the 'Nero won't work' thread, but relevant to this one, I think.
Jim Carroll
I'm sure everybody is aware, but it doesn't do any harm to remind.
CDs have a shelf life (7 years was mooted to me once).
We have spent the last few years storing our collection on external hard discs, and have housed copies in the National Sound Archive at the British Library and at the Irish Traditional Music Archive in Dublin - we have also deposited copies with trusted friends.
Any valuable or irreplacable material you have is well worth the money and effort of backing up somewhere.
Ironically, it is reel-to-reel recordings that have stood the test of time better than all other formats (some of ours date back to the mid 1960s