First I get this error message which makes no sense whatsoever: (not verbatim as it wouldn't let me copy it) "This backup requires 435 MB of space and the Backup HD has only 9.16 GB therefore the backup could not continue" Yes, 435 MB is smaller than 9 GB, it makes no sense. Then I check the HD and it indeed shows that I only have 300 MBs left which is also bizarre being that I checked the HD just yesterday and it showed 9 GBs of space available. I don't see what would have used up 9 gigs of space as I didn't even add anything to my computer in the last day. The only thing I did different was add a 2 gig stick of ram (which shouldn't have any effect on time machine!). Also, is there a way to have TM just delete old stuff so that theres always room? Any ideas as to whats going on?