I don't see the drive connection type is as important as making sure your backup data stays encrypted. Now doing this across different operating systems is clu

I don't see the drive connection type is as important as making sure your backup data stays encrypted. Now doing this across different operating systems is clunky and quite challenging. You could use something like True Crypt or Vera Crypt, but mounting your drive then won't be typically as simple as plugging it in. For that reason it's probably better to have a separate computer for backups connected to the network. That way you don't need to care about encryption on every system you connect it to. It just works (tm).