I don't bother with a CD. I use hard drives. I have over 4 gigs of poser stuff, 2 gigs of art assets and another 4 gigs of poser misc stuff that's not in the poser dir. That's at least 20 CDs. Hard drives are cheap now. $100 will get you 80 gigs. I also use the removable drive bays which are drive bays that fit in a 5.5 slot and have drawers that let you slide a drive in and out. Basically I have two 80 gig drives that I alternate for backups every 2 or 3 days. I just let it run the copy overnight and alternate the drives. This way I'm never more than 2 days behind and even if one drive goes bad its no more than 4 days behind.