A company wants to implement a differential backup strategy. Which of the following statements is true about differential backups?1.0 MarksDifferential backups are less efficient than full backups.Differential backups are more efficient than full backups.Differential backups only back up the files that have changed since the last full backup.Differential backups back up all files, including those that have not changed since the last full backup.
Question
A company wants to implement a differential backup strategy. Which of the following statements is true about differential backups?1.0 MarksDifferential backups are less efficient than full backups.Differential backups are more efficient than full backups.Differential backups only back up the files that have changed since the last full backup.Differential backups back up all files, including those that have not changed since the last full backup.
Solution
The correct statement about differential backups is: "Differential backups only back up the files that have changed since the last full backup."
Here's why:
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Efficiency: Whether differential backups are more or less efficient than full backups depends on the specific circumstances. However, generally speaking, differential backups are less efficient than full backups in terms of restore time, because they require both the last full backup and all subsequent differential backups to be restored. But they are more efficient in terms of storage space, because they only back up the data that has changed since the last full backup.
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What they back up: Differential backups only back up the files that have changed since the last full backup. This is what differentiates them from full backups, which back up all files, and from incremental backups, which back up only the files that have changed since the most recent backup of any type.
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