After a successful replication group failover, you can perform a failback operation to reestablish replication operations for all replication pairs in the group. Only VMs that are eligible fail back. During a failback operation, all changes to the destination VMs are synced back to the source VMs.
From the navigation pane, go to Disaster Recovery.
The Replication groups page appears.
Under Group name, click a replication group.
The replication group details page appears.
On the Overview tab, in the upper-right area of the page, click Failback.
A message appears that asks you to verify that you want to perform the failback.
The destination VMs are turned off.
An incremental backup job runs on the destination VMs.
Any changes are restored to the source VMs.
The source VMs are turned on.
Sync resumes for the VMs.