What is the purpose of failback in a redundant system?

• A. Returning to the primary system when the DR site is healthy.
• B. Permanently switching to the DR site after a disruption.
• C. Returning operations to the primary system once it is healthy again.
• D. Backing up data to the DR site.

Answer: (C)

Failback means moving operations back to the original primary system after it has been repaired and is healthy again. After a failover, you keep running on the DR site to meet service targets while the primary is down or degraded. Once the primary is restored, validated, and data is synchronized, you switch operations back to it and resume normal, primary-site operations. This is different from permanently switching to the DR site (that would be taking over permanently) or simply backing up data to the DR site (a protection measure, not the process of restoring normal operations to the primary).