I've setup SQL Hosts by adding the SLQ Cluster name (which added the SQL Servers as hosts as well). The one challenge with this setup is that Snapcenter backups up both the Primary and Secondary SQL Servers almost at the same time which really isn't needed nor ideal. It also causes failures on the secondary node databases many times with an error that the databases cannot contact primary (probably because of the timing between primary truncating logs or freezing database,etc). It usually only the busy databases that generate the error, but not everytime either.
Realistically the backups should allow us to define if we want backups to run on the primary or secondary nodes only (depending on our preference). Running it on both the primary and secondary is highly redundant....
Anyone know how to configure it so it only backs up one of the nodes of the SQL always on availability group.