Quote:
Originally Posted by MightyDuck
This is why database is local and only library is on NAS. This way should be safe.
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Nope.
The most common error is a failure of the network file system to completely / correctly implement link and locking semantics. Calibre uses these to atomically rename author and title directories. When they fail, files (books, covers, etc) are left in the old directory thereby disappearing from calibre. Repairing the breakage is tedious.
One safe way to do what you want is keep the library on a local drive and from time to time sync it to the NAS. You must ensure that the calibre server on the NAS is not running when you do the sync. You must also ensure that no changes are made to the library by the content server, as they will be lost by the sync.
Even better is to run full calibre (GUI and server) on the NAS and connect to it using some remote desktop.