I am running TI 9 with build 2337 on a windows XP machine. With past backup programs whenever I performed a differential backup, the previous differential was overwritten so that I had only the one current differential at any given time. With TI 9, it just keeps adding differentials as additional archive files. I started with a complete backup of my C partition. It was divided into 3 archive files of 4.34 gigs so that I could burn to DVD. After the complete backup I scheduled a backup selecting differential. This would perform everyday at 1:00 PM. I now have 8 archive files numbered 1 thru 8 with the first 3 being the full backup of partition C and the rest are differentials. Is this how TI 9 works? Do I delete 4 through 7 and keep the latest ( 8 )? I never saw a choice to overwrite the previous differential...or did I miss it? When I was setting up the differential, I could choose between archive file 1, 2, or 3 of the full backup of partition C, although they were all the same backup. Do I choose the first of three archives when setting up a differential or do I select the third of three archives? This is confusing to me. Usually the last archive file is used when restoring. Any help would be appreciated.