AppSync Service Plans - Removing an Exchange Database

What would be the impact of removing a database from an active service plan.  I need to remove 1 DB from a service plan so it does not get a snapshot, but keep the existing sanpshots in tact.

I currently keep 30 days of snapshots, the service plans in question has 12 DB & logs snaps.  If i remove a DB from the Service plan, What happens to the 30 day copies.

As the 30 day setting is on the service plan as a whole will it keep 30 days of the removed DB and what happens to the other 11 DB's.  Do they only keep 30 days or being a service plan and CG will they stop expiring and keep adding on each day, due to the fact that a DB in the service has only 30 copies.