Business Continuity, Disaster Recovery, and Incident Response →mediumMultiple ChoiceObjective-mapped
ISC2 CC Practice Question: Business Continuity, Disaster Recovery, and Incident Response
A company’s backup strategy: Full backup every Sunday, differential backups Monday through Saturday. On Thursday, the system fails. How many backups are needed to restore the data?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Two: Sunday full and Thursday differential
A differential backup contains all changes since the last full backup. So you only need the full backup from Sunday and the differential from Thursday.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Two: Sunday full and Thursday differential
Why this is correct
Correct: full + differential.
- ✗
One: Thursday differential only
Why it's wrong here
The full backup is also required as a base.
- ✗
Four: Monday through Thursday differentials
Why it's wrong here
Only the latest differential is needed.
- ✗
Five: Monday through Thursday differentials plus full
Why it's wrong here
Differential includes all changes since full, so only the latest differential is needed.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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