Certified Information Security Manager (CISM) — Question 43

Which of the following backup methods requires the MOST time to restore data for an application?

Answer options

• A. Disk mirroring
• B. Differential
• C. Incremental
• D. Full backup

Correct answer: C

Explanation

The Incremental backup method requires the most time to restore data because it involves retrieving the last full backup and then all subsequent incremental backups. In contrast, Full backups restore everything in one go, while Differential backups only restore changes since the last full backup, making them faster than Incremental backups.