Manual sync is not a problem at all (e.g. via Robocopy/rsync etc), only syncing via Onedrive/Gdrive/Dropbox/etc might lead to problems due to file locking etc.
Putting the Calibre library on a NAS might lead to problems if the DB is accessed by multiple users at the same time. It's also not recommended using Calibre and calibre-web on the same DB at the same time.
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