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.