My setup: rsync to Synology NAS, snapshotting there, sync to remote Synology NAS over VPN. (The other NAS is at my parent's and they have similar setup syncing to me)

The best part: it is just files, not some proprietary archive. I have high confidence in this. I can restore with the most rudimentary tools.

This setup has worked for me well on linux, windows and now mac. I migrated to new computer&os by restoring the backup mostly.