I got a test box set up with nixos and a config that runs all of my services. I wanted to test the declarative rebuild promise of it, so I:

And it worked!!! All serviced came back with the data, all configuration was correct.

I’m going to keep testing, and depending on how that goes I may switch my prod server and nas to nixos.

Very cool!

Re: the backup / restore of state in NixOS: I found myself writing the same things over and over again for each VM/service, so finally wrote this wrapper module (in action e.g. here for Jellyfin), which confgures both the backup services and timers, as well as adding a simple rsync-restore-jellyfin command to the system packages. In case you find this useful and don’t already have your own abstractions, or a sufficiently different use case 😄