Explanation/Reference:
Explanation:

-ReplicationMode
Specifies the desired mode of replication for this source and destination pair. The acceptable values for this parameter are:
Synchronous or 1. The synchronous mode requires all writes to commit on the destination server and

on the source server, which guarantees data integrity between computers.
Asynchronous or 2. The asynchronous mode writes to the source server without waiting for the

destination server, which allows for replication over high latency, geographic networks. The default value is synchronous.
The default asynchronous recovery point alert time is 5 minutes. You can modify it by using the SetSRPartnership cmdlet. The alert time has no effect on replication behavior, only on reporting.
References:
https://docs.microsoft.com/en-us/powershell/module/storagereplica/new-srpartnership?view=win10-ps
https://msandbu.wordpress.com/2016/05/13/getting-started-with-storage-replica-in-windows-server-2016/
https://www.starwindsoftware.com/blog/how-to-configure-storage-replication-using-windows-server-2016- part-1