Which of the following backup methodologies would be most efficient in backing up a database...

Database backup methodologies ensure data protection and recovery in case of failures, system crashes, or cyber incidents. The most efficient method balances performance, storage, and recovery speed.

Incremental Backup on a Daily Basis (Correct Answer: D)

Incremental backups store only the changes made since the last backup.

This method saves storage space and reduces backup time, making it highly efficient for large production databases.

IIA Standard 2120 – Risk Management emphasizes that auditors must assess the efficiency and reliability of IT controls, including backup strategies.

This approach minimizes downtime and ensures the most recent data is available for recovery.

Why the Other Options Are Incorrect:

A. Disk Mirroring (Incorrect)

Disk mirroring (RAID 1) creates an exact real-time copy of data, but it is not a backup method—it only provides redundancy.

If corruption occurs in the database, the mirrored disk will also have corrupted data.

B. Weekly Differential Backup (Incorrect)

Differential backups store changes since the last full backup, but performing them only weekly means data loss could be significant if a failure occurs mid-week.

They consume more storage over time compared to incremental backups.

C. Independent Disk Array (Incorrect)

Redundant Arrays of Independent Disks (RAID) are primarily used for storage performance and fault tolerance, not as an efficient backup methodology.

RAID does not replace the need for incremental or full backups.

IIA Standard 2120 – Risk Management (Assessing IT controls, including backup and data recovery strategies)

IIA Standard 2110 – Governance (Ensuring IT risk management aligns with organizational objectives)

IIA Standard 2130 – Compliance (Verifying adherence to IT security and backup policies)

Step-by-Step Justification:IIA References for This Answer:Thus, the best answer is D. An incremental backup of the database on a daily basis, as it optimizes efficiency, reduces storage usage, and ensures up-to-date backups with minimal disruption.