CompTIA Cloud+ Practice Test

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Which method is primarily used for efficient backup by tracking modified data only?

Complete Backup
Differential Backup
Incremental Backup
Server Backup

The correct answer is: Differential Backup

The correct answer is the differential backup method because it focuses on tracking only the data that has changed since the last complete backup. This approach streamlines the backup process by reducing the amount of data that needs to be archived compared to a complete backup, which captures all data regardless of its modification status. On the other hand, when using a differential backup, after the initial complete backup, only files that have been altered or added since that full backup are saved. This methodology allows for quicker backup times and more efficient use of storage, as it avoids redundancy by not backing up unchanged data multiple times. In recovery scenarios, restoring from a complete backup followed by the latest differential backup is quicker than recovering from multiple incremental backups, which would need to be restored sequentially. The other methods mentioned have different characteristics: a complete backup captures everything regardless of any changes, an incremental backup saves only the data that changed since the last backup (which could be either a complete or another incremental backup), while the term "server backup" does not specify a particular backup method.