Which backup method is used if backup time is critical and tape space is at an extreme premium?
Correct Answer: A
Explanation/Reference:
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.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 936