Which backup type run at regular intervals would take the least time to complete?

A.
Full Backup

B.
Differential Backup

C.
Incremental Backup

D.
Disk Mirroring

Explanation:
An incremental backup copies only the files that have been modified since the previous backup. An incremental
backup copies less data compared to full and differential backups.
Incorrect Answers:
A: A full backup copies all the data from the system to the backup medium. It copies more data compared to an
incremental backup.
B: A differential backup is a type of data backup that preserves data, saving only the difference in the data
since the last full backup. But a differential backup copies more data compared to an incremental backup.
D: Disk mirroring works dynamically in real-time. Disk mirroring does not take place at regular intervals.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 1410