SG0-001 · Question #409
Which of the following describes a differential backup?
The correct answer is D. Backs up all data in the backup set since the last full backup. A differential backup copies all data that has changed since the last full backup, providing a faster restore time than incremental backups by only needing two backups.
Question
Which of the following describes a differential backup?
Options
- ABacks up all data in the backup set
- BBacks up all data in the backup set since the last incremental backup
- CBacks up all data in the backup set since the last differential backup
- DBacks up all data in the backup set since the last full backup
How the community answered
(33 responses)- A3% (1)
- B3% (1)
- C6% (2)
- D88% (29)
Why each option
A differential backup copies all data that has changed since the last full backup, providing a faster restore time than incremental backups by only needing two backups.
This describes a full backup, not a differential backup, as a full backup copies all data regardless of change status.
This is incorrect; a differential backup relates to the last full backup, not the last incremental backup.
A differential backup is based on the last full backup, not the last differential backup, otherwise it would behave like an incremental backup or be redundant.
A differential backup captures all changes that have occurred since the most recent full backup. This method accumulates changes over time, requiring only the last full backup and the latest differential backup for a complete restore.
Concept tested: Differential backup definition and behavior
Source: https://learn.microsoft.com/en-us/windows-server/administration/windows-server-backup/what-is-windows-server-backup
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