Failback is a specific type of fault tolerance that occurs when a redundant storage server offers an exact replica of the real-time data, and if the primary server crashes, the users are automatically directed to the secondary server or backup server.

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Failback is the process of returning to the primary system or server after a failover to a secondary (backup) system has occurred, once the primary system is back online and functioning properly. It is not a type of fault tolerance but a part of the overall disaster recovery and high availability strategy. Fault tolerance typically refers to the ability of a system to continue operating without interruption when one or more of its components fail.

Failback Is a Specific Type of Fault Tolerance That Occurs