I’m running True Image 9.0 and have scheduled daily differential back-ups. The back-up seems to take forever (hours) and they appear to be bigger in size than I thought they should be. My OS (XP Pro) and files, photos etc take up about 40 GB on my C drive. The differential back-ups take up to 25 GB a go so seem to be eating space on my external hard drive where they are stored. I have set it up by pointing to the original full back-up I did, which I think is correct? I'm sure I get the "differential" radio button clicked when I edit/set up. Tonight it seems to have come to a grinding halt "locking partition C". It occasional seems to "forget" user name/password and give me an error message "completed with errors" in the log. Should I be checking NTFS and the other file type boxes? I guess I’m scheduling the the task incorrectly but I can’t work out what it is! A simple guide to what I’m supposed to do or where I’m going wrong would be very helpul!