I do something similar

I have a raspberry pi and a HD, with daily rsync and snapshots (monthly retained indefinitely, weekly retained for a month, daily retained for a week). It's at family's house, connected to my home via WireGuard via a VPS. Tailscale (or anything really) would also work here.

It's a great setup! Just have some watchdog reboot if it can't talk to home (a simple cronjob with ping -c1 home.lan || reboot or similar).

Even our "slow" 35Mbps upload speed is way more than enough for incremental rsyncs of my Immich library. The initial sync was done in person, though.

Good enough. Simple, cheap. Brilliant.

I remember before, you could use crashplan to easily backup to a computer at a friend's house and vice versa. Anyone know any similar tools? The biggest requirement would be that it's easy enough to use that someone who doesn't know what "self hosting" is can do it.