When doing a rolling update (SQL 2012 SP3 in my case), https://goo.gl/2uI8hm states "Backups cannot occur on a database that is in the process of being upgraded". Does this mean that they will fail if you try to run them, or that you shouldn't even try to run them because it could cause the update to fail?
My setup is SQL 2012 Always On, one availability group, one async secondary replica (for DR), and an FCI as the primary.
Chuck