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  • rync's option -u, --update This forces rsync to skip any files which exist on the destination and have a modified time that is newer than the source file. (If an existing destination file has a modification time equal to the source file’s, it will be updated if the sizes are different.) -- This is not exactly what you want, but should help when the time differs 'one way'. So if you 'dry run' rsync with swapped source and target you should be able to catch time differences both ways. Commented Jun 18, 2018 at 4:16