I used to rsync them, but when traffic picked up, I started to fear an inconsistent copy (rsync does verify at the end there are no new changes, and restarts - but i don’t know the exact strategy so I am wear if relying on it).
I switched to doing .backup and rsync that instead - but am considering switching to litestream instead.
In fact, it's super easy to back up as it's in a SQLite database (for now).