Reference

Rollback vs failback - what's the difference?

Rollback undoes an uncommitted failover. Failback is a later, planned move back after commit.

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The Short Answer

Rollback

Reverses a test failover or a live failover that has not been committed: the pre-failover state is restored, the controller-backed target returns to replication mode, and for planned failover the source VM is powered back on where supported.

Commit

Finalizes a live failover. The promoted VM remains production and normal rollback is no longer available.

Failback

A later, planned movement of production back to an original or new primary site after a committed DR event. After commit, protect the promoted VM with a new protection or replication workflow.