Suddenly I noticed I was really low on space on my backup drive, so I did some checking. The files that I back up total about 180GB. I do a full image backup to an 500 GB external drive The compression is set to normal and the estimated file size is about 100 GB, which is what I would expect..... BUT ...it isnt getting compressed... it's about the same size, ie Mybackup.tib is about 180 GB. Why?