Right now my server is Proxmox/Debian/Docker and I've been waiting for it to blow up so I can finally have an excuse to put time into migrating to something better, but after years of barely touching it it still works lol.
This is my first time hearing about NASty. Right now I run NixOS in a VPS with some basic services and have it managed with OpenTofu and for that it works great, but when I migrate my main setup I think I'm going to do a slightly different setup that's still Nix-managed but uses k3s on top of VMs instead of just using NixOS services on the host.
I mostly use NixOS on my laptop right now and really like it, but I might start putting everything in VMs there also, and if that works well use the same configuration between my laptop and server for that.