Which backup method listed below will probably require the backup operator to use the most
number of tapes for a complete system restoration, if a different tape is used every night in a fiveday rotation?

A.
Incremental Backup Method

B.
Ad Hoc Backup Method

C.
Full Backup Method

D.
Differential Backup Method

Explanation:
Most backup methods use the Archive file attribute to determine whether the file should be backed
up or not. The backup software determines which files need to be backed up by checking to see if
the Archive file attribute has been set, and then resets the Archive bit value to null after the backup
procedure. The Incremental Backup Method backs up only files that have been created or modified
since the last backup was made, because the Archive file attribute is reset. This can result in the
backup operator needing several tapes to do a complete restoration, as every tape with changed
files as well as the last full backup tape will need to be restored. * a Full or Complete backup backs
up all files in all directories stored on the server regardless of when the last backup was made and
whether the files have already been backed up. The Archive file attribute is changed to mark that the
files have been backed up, and the tapes or tapes will have all data and applications on it. It’s an
incorrect answer for this question, however, as it’s assumed answers Differential Backup Method
and Incremental Backup Method will additionally require differential or incremental tapes. * the
Differential Backup Method, backs up only files that have been created or modified since the last
backup was made, like an incremental backup. However, the difference between an incremental
backup and a differential backup is that the Archive file attribute is not reset after the differential
backup is completed, therefore the changed file is backed up every time the differential backup is
run. The backup set grows in size until the next full backup as these files continue to be backed up
during each subsequent differential backup, until the next complete backup occurs. The advantage
of this backup method is that the backup operator should only need the full backup and the one
differential backup to restore the system. Table shows these three backup methods. Exhibit:

Answer “Ad Hoc Backup Method” is a distracter.