I am running a mirror RAID, and everything works fine, MOST of the time. Every now and then, I have to do a FULL back up, all over again. The message states "You will need to do a full back up of the drive because the log file that monitors changes to your back up drive cannot be found." This happens, and it takes HOURS to do another FULL back up. I can run back ups for 4 or 5 times, with no problem, and then it does it again. It's driving me NUTZ! Where is this file? What is it called? How can I keep it from being lost? Can anyone help?