Suppose I have 3 nodes AAG , 1 ASYNC.
after failover to the ASYNC node , the former sync mode need to be resume data movement , before resume the data movement , how can I protect the former primary database by taking a backup first ? I see from the internet which we need to use database snapshot ? any other method ?
and at the moment I will need to force failed over to an async node , how can I determine the amount of data loss (by seconds , or by how much MB/GB) , given that we loss contact of the original AG primary anymore .