Try the Oracle Cloud free tier. It’s the best price you can get for a very beefy server: 4 arm64 cores with 24 GB RAM and 250 GB storage. Just don’t put too personal data on there.

For the notifications I would use https://ntfy.sh/ but that doesn’t give you the return channel.

Unstable always. Very rarely the build breaks, but that just means I can’t update my systems for a few days. Due to the atomic updates, my systems themselves have never broken.

Yeah I do, and it’s awesome! I just love having a big overlap in my system configurations, so I can change something once and update my systems all simultaneously and identically. I have one Arch box left and I kinda detest having to log in on it to do system administration. My NixOS boxes can just be updated remotely and atomically, never requiring me to log in on them and do things manually. This is like Ansible on steroids! And then I’m not even talking about using impermanence yet, that totally seals the deal for me.