Id say don’t go down the distributed software route just yet. An option is to keep the NAS and set up a new computer with your router or whatever handling dns to it for services. You should be able to use NAS storage over the network. It’ll be slower, but let’s say you put your database on the big one, then it shouldn’t be so bad since you’ll just make database calls to it.

There are a lot of options. I’m currently learning kubernetes and all that stuff is a big learning curve, so avoid that stuff.

My thoughts: you can do some simple dns load balancing between the two servers at whatever level is handling that. Set up a database on the storage server and let the new computer communicate to it over the network.