Describe a differential backup.

Describe a differential backup.

• A. All files since the last backup
• B. Takes a copy of any new files created or edited since the last full backup
• C. Copies only files that were created since the last incremental backup
• D. Backups data by removing duplicates

Answer: (B)

A differential backup copies every file that has changed or been created since the last full backup. This means after you’ve done a full backup, any edits or new files are included in the next differential, and the set of files grows with each change until the next full backup resets the baseline. For restoration, you would restore the full backup first, then apply the most recent differential to bring everything up to date. This fits the description of taking a copy of new or edited files since the last full backup, and it’s different from backing up only since the last incremental backup or simply copying all files since the previous backup. It’s also not about removing duplicates, which describes deduplication rather than a backup strategy.

A differential backup copies every file that has changed or been created since the last full backup. This means after you’ve done a full backup, any edits or new files are included in the next differential, and the set of files grows with each change until the next full backup resets the baseline. For restoration, you would restore the full backup first, then apply the most recent differential to bring everything up to date. This fits the description of taking a copy of new or edited files since the last full backup, and it’s different from backing up only since the last incremental backup or simply copying all files since the previous backup. It’s also not about removing duplicates, which describes deduplication rather than a backup strategy.