After a successful recovery 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.
Hyper-V failback is only supported on hosts running Windows Server 2016 or above.
Procedure
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From the navigation pane, go to Auto Recovery.
The Recovery groups tab appears.
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Under Group name, click a recovery group.
The recovery group details page appears.
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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.
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If you want to discard any changes that were made to the backup VM before the failback operation, select Discard the changes since failover.
If you select this option, the failback operation becomes an undo failover operation.
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Click Failback.
Results
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The destination VMs are turned off.
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An incremental backup job runs on the destination VMs.
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Any changes are restored to the source VMs.
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The source VMs are turned on.
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Sync resumes for the VMs.