I sent you a message They are bit bare bones compared to other host but I haven’t had any issues with them in over a year. On the wireguard side you’re looking for a spoke and hub setup.
This covers it fairly well. https://www.procustodibus.com/blog/2020/11/wireguard-hub-and-spoke-config/
Good luck.
I’m in the same boat so I setup a $2.50/mo VPS and that’s my gateway. It took a little bit to get the nftables on vps to work right. I’d recomemned tailscale or similar if you want easy, though I’ve not ever used them myself.
I use shelter from fdroid never had any i ssues. It does what it is suppose to, guess there really isn’t a need for an update.
Just for anyone that wants to try Borg but wants a good ui, borgbase made “vorta” that is a great ui. Plus Borg has 2.0 around the corner.
I’ve used raspberry pi os and shortly arch arm, both work ok. I remeber having an issue with some python packages on arch arm, but thats it. Personally I chose Debian testing for my headless pi4 and have been happy. It’s running Syncthing, Mariadb, a few python scripts to pull data from pi pico-w. FTP server for IP cameras recording, Pydio, Pihole, and Gitea.
Syncthing is great for mirroring files across any number of devices. I use it and love it. Just remember Syncthing itself, is not a backup solution.
At best it will add whatever the extra hop is and any network congestion. My VPS host is 2200km away. I should find a closer one… but it adds 160ms with some spikes in the 200-300 range. This is round trip 4400km roughly All things considered not too bad. My VPS is a 1vCPU, 1GB ram, 1Gbit unmetered, only as wireguard server. Hope that helps.