Certified Information Systems Auditor (CISA) — Question 1240

Which of the following is the MOST efficient approach for backing up large quantities of information in a critical system that must be online 24 hours a day?

Answer options

• A. Full backup to tape daily and incremental backup weekly
• B. Hot site with identical server and storage
• C. Fault-tolerant disk-to-disk solution
• D. Storage area network (SAN)

Correct answer: C

Explanation

The correct answer is C because a fault-tolerant disk-to-disk solution allows for continuous data availability and efficient backup without significant downtime. Option A is less efficient due to the daily full backup requirement, while option B involves higher costs and complexity. Option D, while beneficial for storage, does not directly address the backup efficiency needed for critical systems.