Which type of tape backup requires a maximum of two tapes to perform a restoration?

Which type of tape backup requires a maximum of two tapes to perform a restoration?

A.
Differential backup

B.
Electronic vaulting

C.
Full backup

D.
Incremental backup

Explanation:
Answer A is correct; Differential backups archive data which has changed since the last full backup. During restoration, at most only the last full and differential tapes are required.

Incorrect Answers and Explanations: B, C, and D: Answers B, C, and D are incorrect. Electronic vaulting is a batch process that does not use tape. Full backups archive all data: only one tape is required to restore a full backup. Incremental Backups backup all data which has changed since the last full or incremental backup. Depending on the timing of the restoration, multiple incremental tapes may be required in addition to the most recent full backup.