CGRC · Question #484
A differential backup stores files that were created or modified since the last full backup. Therefore, if a file is changed after the previous full backup, a differential backup will save the file…
The correct answer is A. Differential (Backup). The question provides a detailed description of a specific backup type, emphasizing that it backs up all changes since the last full backup and simplifies restoration by only needing the last full and the most recent of its type, which precisely defines a differential backup.
Question
A differential backup stores files that were created or modified since the last full backup. Therefore, if a file is changed after the previous full backup, a differential backup will save the file each time until the next full backup is completed. The differential backup takes less time to complete then a full backup. Restoring from a differential backup may require less media than an incremental backup because only the full backup and the last differential media would be needed. As a disadvantage, differential backups take longer to complete than incremental backups because the amount of data since the last full backup increases each day until the next full backup is executed. Response:
Options
- ADifferential (Backup)
- BFull (Backup)
- CIncremental (Backup)
- DData (Backup)
How the community answered
(36 responses)- A94% (34)
- B3% (1)
- C3% (1)
Why each option
The question provides a detailed description of a specific backup type, emphasizing that it backs up all changes since the last full backup and simplifies restoration by only needing the last full and the most recent of its type, which precisely defines a differential backup.
A differential backup stores all files that have changed since the last full backup. This means each differential backup grows in size over time until a new full backup occurs, making the restoration process simpler by only requiring the last full backup and the most recent differential backup.
A full backup copies all selected data regardless of whether it has changed since the last backup, which is not what the description outlines.
An incremental backup copies only the data that has changed since the last backup of any type, requiring all previous backups for a full restore, unlike the description.
Data backup is a general term for the process of copying data, not a specific type with the described characteristics.
Concept tested: Differential backup characteristics
Source: https://learn.microsoft.com/en-us/windows/win32/backup/backup-applications
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