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OneWay sync (make a shadow copy) is fine to a NAS.
Two way can be a disaster, as there could be a 'race condition', where the DB and the actual book files get out of version order.
NEVER sync with Calibre/Server Running (Library changes won't happen if you are not using it)
I use Free file Sync. It takes ~3 Min to scan for changes and 1 to write the files updated.
FWIW Google drive messes with file names (uses something that looks like what C does for {id} . That = disaster)
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