Ubuntu 20.04.1 desktop edition is the current recommendation, but you could also use Ubuntu server if you’re familiar with the terminal. Check out JDM’s guide here for a walkthrough on configuring your NAS as well as your new Prodesk. All of the Plex data will be on the Prodesk, and backing it up is optional. You could potentially set something up like timeshift if you wanted to configure an automatic backup.
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