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Hello all, I have a machine with Retrospect 14.1.0 (138) that I am using disk backup sets connected via USB to a 2007 iMac with 10.11.6 El Capitan which is the latest it can run. I get regular error -641 chunk checksum errors. When I get them, it appears the backup is toast. Two questions, 1 why are they happening, and 2 how can I recover. I have been fight these for over a year on previous version and I am just about feed up. If it helps, retrospect is spontaneously restarting from time to time too. John