There are folk who run the content server on a NAS.
The prohibition is using a NAS (or any network share) in a client (PC)-server configuration. There is a LOT of file system stuff going on when certain tasks are done. They need to remain in lockstep, which can't be guaranteed on a desktop app with files on a network. bad things can happen to your (Library) data
Only ONE Calibre session (the server is a session and can have multiple clients) can use a Library at a time.
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