"Normal" backup backs up too much in Professional Posted April 6, 2010 · Report reply Welcome to the fun and unpredictable world of Retrospect's incremental logic. But it is a major PIA due to the time to do that first backup (all files), and more importantly, it starts appending to your existing backup set, essentially doubling the media requirements. I've had this happen twice, with each version update. For some reason, Retrospect seems to not recognize the previous snapshots and which files have not changed. Never got a good explanation, but if it happens once every couple of years, I guess it's tolerable. Bob.