It works if you remark broken files before you update and erase your old backup. Also, if you use same mp3 files with many devices (multiple computers with own copies of them/without NAS + mobile phone or some another player) identification them to same ripped version is not possibly with apps like CloneSpy, so it is hard detect is file damaged or mappy re-ripped/re-tagged because of some issue and be forgotten to update different devices.
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