What is a primary disadvantage of differential backups when compared to full backups?

• A. They are more time-consuming
• B. They require more storage for each backup
• C. They lead to longer restoration times
• D. They can risk data loss if not managed properly

Answer: (D)

The primary disadvantage of differential backups in comparison to full backups lies in the potential for data loss if they are not managed properly. With differential backups, each backup captures all changes made since the last full backup. If a series of differential backups is not managed or maintained effectively, such as failing to ensure all necessary differential backups are available for restoration, data may be lost. This risk is compounded if a damaged or corrupt differential backup has to be restored; without the full backup and all proper differentials, you can't accurately recover to the desired point in time.

In contrast, full backups contain all files and data in one complete set, making them reliable for a full restoration without the complexities involved in managing multiple differential backups. While there are valid concerns about time consumption, storage requirements, and restoration times related to differential backups, the crucial factor highlighted in this context is the risk of data loss through mismanagement.