Certified Information Systems Auditor (CISA) — Question 1125

Which of the following backup schemes is the BEST option when storage media is limited?

Answer options

• A. Real-time backup
• B. Differential backup
• C. Virtual backup
• D. Full backup

Correct answer: B

Explanation

Differential backup is the best option in this scenario because it only saves the data that has changed since the last full backup, thus requiring less storage space compared to a full backup, which copies all data. Real-time backup continuously updates data, potentially consuming more storage, while virtual backup is not a defined backup scheme. Therefore, the other options are less efficient in terms of storage usage.