kg4wsv:
Writable and rewritable CD and DVD disks have a very short life, in archival terms. They're good for maybe 5 years.
Absolutely this. I won't use optical discs for backup again.
I put my mp3 collection onto about 20 CDs in the early noughties, about half of them are readable now.
My step-mother uses an old apple for her accounts and diligently backs up her work onto a zip disc. I've pointed out a couple of times that if the machine fails she'll have some difficulty finding anyone with a zip drive to restore her archive from.