Jesus Christ, Plex still doesn’t see the need for local (Server side) authentication?
https://wdpassport.plex.tv/
“Use Offline (With the WD Pro App) No internet, no problem. Connect your devices to your My Passport Wireless Pro and stream any compatible content, without the need for an internet connection.”
How about this, if you have a plexPass and a PlexHome with Plex Accounts (that have to agree to be in the home anyway) you can store their credentials on all of your servers (you can only have plex Home on one server)