Way back when, my Dad always told me to have at least three copies of everything, because one backup is no backup. So I have a 1TB Storage Box at Hetzner (€4/month, in a different datacenter than my VPSes) I push backups to with Restic. I also backup to a local machine (also with restic), and to my Dad’s NAS (you guessed, with restic), and to my old Debian server until I decommission it (also with restic).

All legs have different retention settings, based on how much space I have at a particular backup site.

Check their docs, mostly.

If all your services support binding to a unix socket, I’d bind them to /run/<servicename>.sock or similar, and set up a reverse proxy that hits /run/$servicename.sock when serving $servicename.devicename.lan. If the service can’t bind to a unix socket, you can probably socat it or similar, and keep using the generic reverse proxy. Then, all your router has to do is route port 80 to your Debian machine.

Yes. My Actual Intelligence lives in my head, and runs mostly on coffee.