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CISA Practice Question: A company's backup policy requires daily full…
A company's backup policy requires daily full backups to tape and offsite storage. After a ransomware attack, the IT team discovers that the latest backup set is corrupted. Which of the following controls would have BEST prevented this?
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
✓
Implementation of immutable backup storage
Immutable backup storage ensures backups cannot be altered or deleted, preventing corruption from ransomware. Encryption protects confidentiality, not integrity; logging detects but does not prevent; restoration testing detects corruption after the fact.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Implementation of immutable backup storage
Why this is correct
Correct: Immutability prevents alteration, protecting backup integrity.
- ✗
Encryption of backup tapes
Why it's wrong here
Encryption protects data confidentiality, not integrity.
- ✗
Periodic restoration testing
Why it's wrong here
Testing detects corruption but does not prevent it.
- ✗
Journaling of backup logs
Why it's wrong here
Logging helps audit but does not prevent corruption.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CISA practice question is part of Courseiva's free ISACA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CISA exam.