Which of the following backup method must be made regardless of whether Differential or Incremental methods are used?
Correct Answer: A
Explanation/Reference:
Explanation:
A Full Backup must be made regardless of whether Differential or Incremental methods are used.
The Full Backup Method makes a complete backup of every file on the server every time it is run. The full backup will reset the archive bits on all the files that were backed up. The archive bits are used by incremental and differential backups to determine which files have been changed since the full backup and therefore, which files need to be backed up.
Incorrect Answers:
B: Incremental backups back up all files that were changed since the last full or incremental backup. You do not have to use incremental backups.
C: "Supplemental" is not the backup type that must be made regardless of whether Differential or Incremental methods are used. A supplemental backup is an 'extra' or 'additional' backup; it is not part of the regular backup schedule.
D: The tape backup method is not one of the defined backup types; it just specifies that the files are backed up to tape.
References:
Krutz, Ronald L. and Russel Dean Vines, The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, New York, 2001, p. 69