MCQs

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1. What does a differential backup store?
   a. All data on a system every time
   b. Only data changed since the last incremental backup
   c. Only data changed since the last full backup
   d. Only files older than a month
   Answer: c. Only data changed since the last full backuptechtarget+1
2. Which type of backup is taken first before starting differential backups?
   a. Incremental backup
   b. Full backup
   c. Cloud backup
   d. No backup is needed
   Answer: b. Full backupunitrends+1
3. On Tuesday, a differential backup would save changes made since which backup?
   a. Monday’s incremental
   b. Monday’s differential
   c. Last full backup
   d. None of the above
   Answer: c. Last full backupnakivo+1
4. What is a major advantage of differential backups over full backups?
   a. They always use more storage
   b. They are generally faster and use less storage
   c. They require no initial backup
   d. They back up empty files
   Answer: b. They are generally faster and use less storageunitrends+1
5. Which backup strategy usually provides the fastest restore times after a failure?
   a. Full backup only
   b. Incremental backup
   c. Differential backup
   d. No backup
   Answer: c. Differential backuptechtarget+1
6. How often do differential backups record data compared to incremental?
   a. Since last full backup
   b. Since last partial backup
   c. Since last incremental backup
   d. Since last backup of any kind
   Answer: a. Since last full backuptechtarget+1
7. If data is lost, what do you need to restore using differential backup?
   a. Every backup ever made
   b. Last full and the most recent differential backup
   c. Only the latest differential
   d. Only the original full backup
   Answer: b. Last full and the most recent differential backupblogvault+1
8. Which of the following does NOT describe differential backup?
   a. Cumulative backup
   b. Backs up only new or changed files since the last full backup
   c. Requires every daily backup to restore
   d. Reduces restore complexity compared to incremental
   Answer: c. Requires every daily backup to restorenakivo+1
9. What happens to the size of differential backups as time passes after a full backup?
   a. Size decreases
   b. Stays the same
   c. Increases
   d. Disappears
   Answer: c. Increasesblogvault+1
10. Differential backups are most helpful in what type of scenario?
    a. No changes in data
    b. Data changes occasionally, but not every hour
    c. Data never changes
    d. Data is deleted daily
    Answer: b. Data changes occasionally, but not every hourunitrends+1
11. Which backup method is more storage-efficient over long periods?
    a. Full backup
    b. Differential backup
    c. Incremental backup
    d. None of the above
    Answer: c. Incremental backupaws.amazon+1
12. Why might a company use a differential backup instead of a full backup every day?
    a. It always fails
    b. It uses less time and storage than a daily full backup
    c. It is illegal
    d. It loses more data
    Answer: b. It uses less time and storage than a daily full backupnakivo+1
13. For restoring data using a differential backup, what is required?
    a. Only the latest full backup
    b. Only the oldest backup
    c. The full backup and the latest differential backup
    d. Only the latest incremental backup
    Answer: c. The full backup and the latest differential backupblogvault+1
14. What is one disadvantage of differential backups compared to incremental backups?
    a. Restores are slower
    b. More backups are needed to restore
    c. Backup size grows larger over time
    d. It requires more manual steps
    Answer: c. Backup size grows larger over timenakivo+1
15. In case of a ransomware attack, why is differential backup valuable?
    a. It is not valuable
    b. It keeps clean versions of files that can be restored
    c. It increases risk of infection
    d. It uses more bandwidth
    Answer: b. It keeps clean versions of files that can be restoredcyberpedia.reasonlabs
16. Which is true about the frequency of differential backups?
    a. They replace full backups entirely
    b. They are typically done between full backups
    c. They are only done monthly
    d. They are only done yearly
    Answer: b. They are typically done between full backupstechtarget+1
17. Differential backup is most similar to which other backup type, in terms of process?
    a. Incremental backup
    b. Cloud backup
    c. Snapshot
    d. Continuous backup
    Answer: a. Incremental backupsanfoundry+1
18. How does a differential backup help reduce data loss risk?
    a. By not saving files
    b. By creating copies of changed files regularly
    c. By deleting files every day
    d. By limiting network access
    Answer: b. By creating copies of changed files regularlyinfrascale+1
19. What could cause a differential backup restore to fail?
    a. Missing the last differential or full backup file
    b. Only missing an old incremental backup
    c. Not using cloud storage
    d. Using too many disks
    Answer: a. Missing the last differential or full backup fileunitrends+1
20. Differential backup is best described as:
    a. A backup method that makes identical copies daily
    b. A method saving all changes since the last full backup
    c. A random backup schedule
    d. A backup for only one file
    Answer: b. A method saving all changes since the last full backuptechtarget+1
21. What is required to perform the first differential backup?
    a. Full backup must already be done
    b. Incremental backup must be done first
    c. No prior backups
    d. Any backup type
    Answer: a. Full backup must already be doneunitrends+1
22. Why do organizations use periodic full backups along with differential backups?
    a. To keep backup sizes manageable
    b. To reduce speed
    c. To delete old data
    d. For no reason
    Answer: a. To keep backup sizes manageableblogvault+1
23. What will Wednesday’s differential backup contain, if the last full backup was made on Sunday?
    a. Only Wednesday’s changes
    b. Anything changed since Sunday
    c. All files
    d. Nothing
    Answer: b. Anything changed since Sundaytechtarget+1
24. What is one benefit of using differential backup in cybersecurity incident recovery?
    a. Simplifies restoration by only needing two files
    b. Requires a cloud provider
    c. Deletes original files
    d. Slows the recovery
    Answer: a. Simplifies restoration by only needing two filesnakivo+1
25. When does a differential backup reset its data size?
    a. Every night
    b. Every incremental backup
    c. Whenever a new full backup is run
    d. Never
    Answer: c. Whenever a new full backup is runblogvault+1
26. Which backup provides the fastest backup speed?
    a. Full backup
    b. Differential backup
    c. Incremental backup
    d. No backup
    Answer: c. Incremental backupaws.amazon+1
27. Differential backup is part of which kind of security strategy?
    a. Backup and restoration
    b. Perimeter protection
    c. User access management
    d. Firewall management
    Answer: a. Backup and restorationcyberpedia.reasonlabs+1
28. What happens if you only use differential backups and never do another full backup?
    a. Differential backups shrink
    b. Differential backups eventually become as large as a full backup
    c. Data is deleted
    d. Only one backup is needed
    Answer: b. Differential backups eventually become as large as a full backupnakivo+1
29. What restores are possible with a corrupted last differential backup?
    a. Restore is still possible with older differential backups
    b. Restore is impossible unless you have both full and most recent good differential
    c. Only incremental backup helps
    d. You do not need backups
    Answer: b. Restore is impossible unless you have both full and most recent good differentialunitrends+1
30. If only minor changes happen daily, how does differential backup compare to full backup?
    a. Normally much more storage efficient
    b. Always requires more hard drives
    c. Never saves space
    d. Is not useful
    Answer: a. Normally much more storage efficientunitrends+1
31. Which of the following files are included in a Monday differential backup after a Sunday full backup?
    a. Only unchanged files
    b. Files changed since Monday
    c. Files changed since Sunday
    d. All files
    Answer: c. Files changed since Sundaytechtarget+1
32. Which backup strategy should you choose for faster data restoration and moderate backup size?
    a. Only full backups
    b. Only incremental
    c. Differential backup with regular full backups
    d. No backup
    Answer: c. Differential backup with regular full backupsblogvault+1
33. Which term best describes the storage requirements for differential backups over time?
    a. Shrinking
    b. Expanding
    c. Static
    d. Minimal
    Answer: b. Expandingnakivo+1
34. Which two types of backup are commonly compared to differential backup?
    a. Mirror & partial
    b. Incremental & full backup
    c. Snapshot & archive
    d. Cloud & remote
    Answer: b. Incremental & full backupsanfoundry+1
35. Differential backup is NOT ideal if:
    a. You want fast restores
    b. You back up huge, rapidly-changing data daily without frequent full backups
    c. Your data changes infrequently
    d. You need moderate storage use
    Answer: b. You back up huge, rapidly-changing data daily without frequent full backupsblogvault+1
36. Which statement is FALSE about differential backup?
    a. It always needs only one backup for restore
    b. It backs up changes since last full backup
    c. Its size grows without new full backups
    d. Only two files are needed for a restore
    Answer: a. It always needs only one backup for restorenakivo+1
37. If a system does a full backup on Sunday, and differential on Monday, Tuesday, and Wednesday, what will Wednesday’s backup include?
    a. Only Wednesday’s data
    b. Only Tuesday and Wednesday data
    c. Everything changed since Sunday
    d. Nothing
    Answer: c. Everything changed since Sundaytechtarget+1
38. In a disaster recovery scenario, which combination is needed to recover using a differential backup?
    a. Only differential backup
    b. Only full backup
    c. Last full backup and most recent differential backup
    d. Old full backups only
    Answer: c. Last full backup and most recent differential backupblogvault+1
39. Differential backup requires:
    a. The use of cloud platforms
    b. Manual copying
    c. Automated backup software
    d. Incremental restores every day
    Answer: c. Automated backup softwareunitrends+1
40. When are differential backups usually scheduled?
    a. After incremental
    b. As a replacement for full backups
    c. After full backups, on a regular basis
    d. After partial backups
    Answer: c. After full backups, on a regular basistechtarget+1
41. One main reason to use differential backup in cybersecurity:
    a. To prevent data breach
    b. To quickly restore clean data after an attack
    c. To run fast every day
    d. To encrypt all files
    Answer: b. To quickly restore clean data after an attackcyberpedia.reasonlabs
42. Differential backup maintains:
    a. Only files from backup day
    b. A cumulative set of changes since last full backup
    c. Snapshots only
    d. Old versions only
    Answer: b. A cumulative set of changes since last full backupnakivo+1
43. What is typically NOT needed in a differential backup restore process?
    a. Old incremental backups
    b. Latest differential backup
    c. Last full backup
    d. None of the above
    Answer: a. Old incremental backupsblogvault+1
44. As time passes, restoring from differential backup
    a. Becomes faster
    b. May become slower if backup file is large
    c. Always is instant
    d. Is impossible
    Answer: b. May become slower if backup file is largenakivo+1
45. In the backup cycle, differential backup is often used to
    a. Increase the size of the backup
    b. Balance speed of restoration with storage needs
    c. Reduce quality of restoration
    d. Avoid doing full backups
    Answer: b. Balance speed of restoration with storage needsunitrends+1
46. What happens to older differential backup files after a new full backup is created?
    a. They can be safely deleted
    b. They must be kept forever
    c. They become the active backup
    d. They are merged with incremental files
    Answer: a. They can be safely deletedblogvault+1
47. Which backup is most like a ‘snapshot’ of all changes since the start of the week?
    a. Incremental
    b. Differential
    c. Full
    d. None
    Answer: b. Differentialnakivo+1
48. To minimize risk and enable quick restore, what schedule is usually recommended?
    a. Regular full backups and regular differential backups
    b. Only incremental backups
    c. Only cloud backups
    d. No schedule
    Answer: a. Regular full backups and regular differential backupsunitrends+1
49. Which statement best explains differential backup?
    a. Saves only changes since last incremental backup
    b. Saves all changed files since last full backup
    c. Deletes old backups
    d. Restores only new files
    Answer: b. Saves all changed files since last full backuptechtarget+1
50. Differential backup is simple for beginners to understand because
    a. It only involves two restore files: last full and last differential
    b. It never requires full backups
    c. It uses incremental steps
    d. It saves only deleted files
    Answer: a. It only involves two restore files: last full and last differentialblogvault+1

1. https://www.techtarget.com/searchdatabackup/definition/differential-backup
2. https://www.nakivo.com/blog/backup-types-explained/
3. https://www.unitrends.com/blog/types-of-backup-full-incremental-differential/
4. https://blogvault.net/types-of-backup/
5. https://www.techtarget.com/searchdatabackup/feature/Full-incremental-or-differential-How-to-choose-the-correct-backup-type
6. https://aws.amazon.com/compare/the-difference-between-incremental-differential-and-other-backups/
7. https://cyberpedia.reasonlabs.com/EN/differential%20backup.html
8. https://www.sanfoundry.com/cloud-computing-questions-answers-backup-types/
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14. https://t4tutorials.com/backup-types-and-strategies-mcqs-in-dbms/
15. https://securityboulevard.com/2020/03/types-of-backup-understanding-full-differential-and-incremental-backup/
16. https://www.acronis.com/en/blog/posts/incremental-differential-backups/
17. https://cloudian.com/guides/data-backup/data-backup-in-depth/
18. https://www.sanfoundry.com/backup-questions-answers/
19. https://cybotech.in/start-quiz/100-mcq-database-backup-types-rdbms-quiz-online-test
20. https://learn.microsoft.com/en-us/previous-versions/office/developer/exchange-server-2010/aa579399(v=exchg.140)