Sounds good, only thing is a Minecraft server will need more ram. I managed to get Minecraft (papermc iirc) on 4gb, but that ran terrible. I would say 6gb minimum and 8gb recommended if you play with more than one person and want to make a bigger world. Also keep in mind if the server is always running it will always consume this amount of ram if you assign the memory when starting the server iirc. And with that jellyfin also would like some ram, for me it uses a few gigs. But from what I see online it could work with less. Nas doesn't use that much if you don't do any crazy stuff.

I used to have 16 and that worked for Minecraft, jellyfin, and various other services at the same time. I now upgraded to 32 and arc eats all of it so non of it goes to waste ;)