I am using ATI v11 Build 8,053, Vista Home and backingup to Acronis Secure Zone on an internal SATA disk (not the OS drive). Following a full backup I do a weekly Differential backup. The current size of the zone is 117 Gb and there is no more space on the drive to increase it. I understand that only the latest differential backup is needed for restore but I can't find any way to delete the older ones. I have checked through this forum but I can't find an answer and would appreciate help to resolve my problem.