The synchronous override mode of replication (also known as soft synchronous mode) is a mode where replication is synchronous, as long as the network is available. If the network becomes unavailable, then replication is continued in the asynchronous mode. The pending updates are sent to the Secondary when the network becomes available. When the data becomes completely synchronized then the replication mode reverts back to being synchronous. Depending on specific needs where you want to have synchronous replication, you can use the synchronous override mode of replication for maximum continuity.