In my case, since I archive to DVD, the entire Runtime is backed up whenever there is enough data to fill one (my Runtime is only about 2.5GB). The reason that I make a full Runtime backup is that it's much easier than collating a bunch of partial backups - stuff you deleted will reappear, as well as problems you may have fixed (though this should be rare) and you have to rifle through a CD set chronologically to restore correctly. Must agree with onnetz. There have been several times that compressed files on CD-R or DVD-R have been corrupt for me (despite working while on hard drive). Don't know why this happens, but when it does, you are truly screwed. Either way, backing up is a good preventative measure for any unforeseeable disasters - hard drive crash, virus, accidental deletion, etc. Patricia, 27 CDs!! Nearly 18GBs! We need a PA (Posers Anonymous). :) goido, yes. Copy them from CD to the proper Poser folder and everything is restored. No need to do any reinstalls of data. DAZ installers just extract the files within and write them into the proper folders within their own folders, so even they'll be restored after a CD restoration. BYS