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Q9. Which of the following describes differential backup?

A. A differential backup backs up all the information on the disk to an offline device such as tape.

B. A differential backup backs up only the information that is added since previous differential backup.

C. A differential backup backs up only the information that is added since last full backup.

D. A differential backup backs up only the information that is added since last incremental backup.

Correct Answer:C

Explanation: 

There are three main Backup strategies:
1. Full Backup: Backs up all data. Takes the longest time to backup, but easy to restore since all files are at one place and you don't need previous back-ups.

2. Incremental backup:Only backs up files added or changed since last backup. Quick to back up, but restore requires multiple tapes (last full backup tape plus all incremental tapes since the last full backup).

3. Only backs up files since last FULL backup. Each backup takes a little longer, but restore requires only two tapes (most recent full backup and most recent differential backup).

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