I wrote a guide with a few options: https://avidandrew.com/elevate-your-note-taking-with-obsidian.html

I personally use SyncThing with the SyncThing-Fork app now

I’m self-hosting Obsidian as described below and it works really well. The syncing happens automatically in the background and I rarely encounter conflicts. I’d highly recommend it! https://avidandrew.com/elevate-your-note-taking-with-obsidian.html

I would think of Incus and Proxmox as equivalent - both can run containers and VMs. I like the idea of 3 incus servers each with a VM in Docker Swarm mode for running your docker services. Then if you have additional services that aren’t a good fit for docker, you can spin them up as separate containers or VMs in incus as needed

This is what I would recommend too - QEMU + libvirt with Sanoid for automatic snapshot management. Incus is also a solid option too

I’ve been meaning to write a guide like this but haven’t had a chance to complete it yet. In short, I’d recommend setting up an Ubuntu Server instance on some old hardware and using incus with ZFS to setup a separate container or VM for each service you want to run: https://linuxcontainers.org/incus/introduction/

This way, if something doesn’t work out, you can just delete the container or VM. It also makes it easy to make snapshots or backups before you make a change (e.g. perform an upgrade) so you can easily roll back.

You can even try incus online (see the above link) to get an idea of how it works.

I use Obsidian - it’s phenomenal! https://avidandrew.com/elevate-your-note-taking-with-obsidian.html

Rather than a cheap VPS, what about hosting a reverse proxy on fly.io, something like this? https://github.com/AnimMouse/frp-flyapp