Well, but it seems that, if you play your mp3’s, the time stamp changes, and robocopy copies all files with the MIR switch again, while of course, the files are exactly the same (they never change). Can you avoid copying mp3’s if for example, the size is the same, of just type a command so robocopy ignores time stamps for mp3’s but matches on filename or so?
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As far as I am aware there is no way to tell robocopy to ignore timestamps when mirroring directories