Hi, I'm a newby on this forum and I have come across a strange behavior with TI 10 (I have build 4871). Problem: c:/ drive is 80Gb with 7Gb used (newish system with not much usage) TI full backup to 2nd hdd produces 3Gb backup. TI set to do differential backup on Windows (XP) closedown produces a 20Mb file even though no work has been done on the PC between the full and 2nd backup. 3rd differential backup is slightly bigger again. If I try incremental backup the 2nd and subsequent files are still many Mbs, again with no work having been done on the PC - not even emails. I'd love to know what's being backed up that is taking so much space. Anyone know the answer?