Another problem we have... We use SQL Server 2014. We did a migration and restored a DB on Server Prod1. During the down-time window, we put the DB in High Availability with Server Prod2. But we didn't have enough time to put the DB in High availability with a remote Server (i.e. for Disaster Recovery). My understanding is that we must halt backups in order to add a Database to a secondary replica. And in this case the Database is large. Maybe 1 hr to backup and 2hrs to copy, another hour to restore. We don't want to stop our tran log backups which happen every 15 min.
Any suggestions? It's a catch 22. Dangerous to temporarily stop backups but dangerous to not have HA function to a DR site.