I'd recommend transferring all these to your normally backed up drives, its amazing how you'll find a box of those disks will not even make a small dent in storage on a Terabyte drive.
@albrecht and
@Dyna-X, thanks, I have the most important stuff already backed up. The disks themselves are more for very rare browsing and mostly because I don't seem to want to throw them out, silly me!
I have my computers backed up regularly on a) a mirror-image software process to external hard drives (more than one, alternating for sequential backups) which backs up the entire drives, software and files and all, b) files backed up in realtime with a reliable secure cloud backup provider, and c) an internal backup software. Redundancy in backups is required in my world, not optional. <g>