Fallback destination connection option?

I have a backup set up to my unRAID box over my LAN (high speed) but it can also be accessed over the internet (slower speed).

I think it might be nice to allow for “failover” destination connection options. I picture it working like this - there’s still only the one destination, but different ways to connect to it:

  1. if can connect via LAN (onsite) use that
  2. else if can connect via SFTP (offsite) use that
  3. fail “destination not available”