Which backup method is used if backup time is critical and tape space is at an extreme premium?

A.
Incremental backup method.

B.
Differential backup method.

C.
Full backup method.

D.
Tape backup method.

Explanation:
An incremental process backs up only the files that have changed since the last full or incremental backup.
Compared to a differential or a full back, an incremental backup copies less files.
Incorrect Answers:
B: A differential backup backs up the files that have been modified since the last full backup. More files are
copies compared to an incremental backup.
C: In a full backup all data are backed up and saved to some type of storage media.
D: A tape backup is any type of backup which backs up data to the tape medium. It can be a full backup, an
incremental backup, or a differential backup.
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 936