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You can run another computer remotely using for instance VNC.
Or you can have a backup of your calibre library on a network share. You backup the calibre library on your main computer to that share, using rsync. Very fast since only changes need to be copied. And you run calibre on the 24/7 computer on a copy of that backup. The copy is updated from the backup also using rsync. The backups and updates can be automatically performed by the scripts that are used to start calibre. Then all you need to do is update the books on your main computer and exit calibre, to take a backup. And reboot or restart calibre on the 24/7 computer, to use the latest backup, possibly using a cron job.
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