Which two data protection techniques provide the highest level of data protection and rapid recovery? (Choose two.)

The question seeks the two options providing the highest data protection and rapid recovery. "Rapid recovery" implies a very low Recovery Time Objective (RTO), best achieved through failover mechanisms like mirroring.

D. Remote mirroring with consistency groups and backup to alternate storage: This offers the highest protection level, covering site-wide disasters. Remote mirroring enables extremely rapid recovery via failover. Consistency groups ensure the integrity of dependent data, which is critical for transactional applications.

A. Local mirroring with backup to tape: This provides rapid recovery from local component failures (e.g., a disk) through failover to the mirrored copy. The combination with backup provides a second data protection layer against logical corruption or larger-scale events.

Both selected options feature a form of mirroring, the key technology for near-instantaneous failover and thus, rapid recovery.

B. Recovery from backup is a restore process, which is significantly slower than a mirror failover. "RAID" is a general term; some levels (e.g., RAID 5) have slow rebuilds.

C. RAID-0 (striping) provides no data protection or redundancy. The failure of a single disk results in the loss of all data in the array.

1. Information Storage and Management: Storing, Managing, and Protecting Digital Information in Classic, Virtualized, and Cloud Environments, 2nd Edition. (EMC Education Services, Wiley, 2012).

Chapter 11: Business Continuity, Section 11.3 "Replication" (pp. 297-303): This section details how replication (mirroring) provides a "current, recoverable copy of data" and enables rapid recovery by failing over to the replica, contrasting it with the slower restore process of backups. It distinguishes between local replication for high availability and remote replication for disaster recovery. This supports the selection of both A and D.

Chapter 10: Backup and Archive, Section 10.2 "Backup Architecture" (p. 264): This section describes backup as a process of restoring data, which inherently involves a higher RTO compared to replication/mirroring technologies. This supports the exclusion of option B as a "most rapid" solution.

2. Patterson, D. A., & Hennessy, J. L. (2017). Computer Organization and Design RISC-V Edition: The Hardware Software Interface. (Morgan Kaufmann).

Chapter 5: Large and Fast: Exploiting Memory Hierarchy, Section 5.10 "Redundant Arrays of Inexpensive Disks" (pp. 407-415): This text explains that RAID 1 (Mirroring) allows for immediate use of the mirrored copy upon a disk failure. It also explains that RAID 0 offers no redundancy, confirming why option C is incorrect.

3. SNIA. (2019). SNIA Dictionary.

Definition of "Remote Mirroring": "The process of duplicating data to a storage system at a remote location... used for disaster recovery." This confirms that remote mirroring is a top-tier data protection technique.

Definition of "Consistency Group": "A set of storage volumes that are replicated with write-order consistency." This highlights its role in ensuring data integrity, a key component of "highest protection."