CD-Rs are cheap enough too burn more than one copy of your backups, that way you have one to use and the other to save. Time is not what wears out the disk, it's using the disk, so have a backup for your backup. I actually have a CD-R with only michael and vicky on it. I had nothing else to back up at the time, but I was not about to risk losing a file I paid 40-60 dollars on, for the sake of a cheap CD-R disk. (I bought 50 disks for $8)