A chief advantage of storing backup data across town is that a person can just head over and get it (or ideally, a copy of it) in the unlikely event that it becomes necessary to recover from a local disaster that wasn't handled by raidz and local snapshots.

The time required to set this stuff up is...not very big.

Things like ZFS and Tailscale may sound daunting, but they're very light processes on even the most garbage-tier levels of vaguely-modern PC hardware and are simple to get working.