Main and backup. The last outage was because they have a single network provider. Those are rare, and can be dealt with relatively easily by dual connecting you

Main and backup. The last outage was because they have a single network provider. Those are rare, and can be dealt with relatively easily by dual connecting your server to two different networks and sharing across both and removing the dns entry for a broken one. But it’s not worthwhile for such a rare outage The “outages” that are common are slowdowns for logged in users.