Noting that this topic has been covered, and the helpful answers therewith, I'd like to repost the question with a variation. My eMac has TWO Previous System folders, one dated December 2005, the other August 2008. The latter date is when Tiger was reinstalled after a repair with Disk Warrior. Examination of the contents of both folders shows a collection of older Apple applications, or duplicates thereof. The folders occupy 10.02 Gb, and I could well do with that disk space. 1. Will deleting both folders affect the current OS, or, asked another way, 2. Is it safe to delete both folders?