SK0-005 security-disaster-recovery Practice Question
A small business has a single file server running Windows Server 2019. The server uses two internal SATA drives in a RAID 1 mirror for the operating system and data. The company's backup solution performs a full backup every night to an external USB hard drive, which is stored in the server room. The IT administrator recently noticed that the server's system volume is running low on space and decides to migrate the data to a larger drive. During the migration, the server crashes and will not boot. The administrator attempts to restore from the latest backup but finds that the backup drive is corrupted and cannot be read. The company has no offsite backups. What should the administrator have done to prevent this situation?
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
✓
Regularly test backup restorations to verify data integrity.
The correct answer is D: Regularly test backup restorations to verify data integrity. The administrator assumed backups were valid without verification. Option A is wrong because RAID 1 provides redundancy but does not protect against corruption or accidental deletion; the issue here is backup corruption. Option B is wrong because cloud backup is a good practice but not strictly required; the root cause is lack of backup testing. Option C is wrong because while documentation is helpful, it would not prevent data loss from a corrupted backup drive.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Regularly test backup restorations to verify data integrity.
Why this is correct
The administrator should perform periodic restore tests to confirm that backups are valid and can be successfully recovered. This would have identified the corrupted backup drive before it was needed.
- ✗
Implement a RAID 5 array instead of RAID 1 for better redundancy.
Why it's wrong here
RAID 5 provides fault tolerance but does not protect against backup corruption or accidental data loss. The problem is the backup was not verified, not the RAID level.
- ✗
Document the backup procedure and create a disaster recovery plan.
Why it's wrong here
Documentation is important but does not ensure backups are restorable. Without testing, the corruption would remain undetected.
- ✗
Use a cloud-based backup service with offsite storage.
Why it's wrong here
Offsite backup is beneficial but does not directly address the need to verify backup integrity. Regular testing is still required even with cloud backups.
Quick reference
RAID Level Comparison
| RAID Level | Min Disks | Fault Tolerance | Read | Write | Usable Capacity |
|---|---|---|---|---|---|
| RAID 0 | 2 | None | Excellent | Excellent | 100% |
| RAID 1 | 2 | 1 disk | Good | Moderate | 50% |
| RAID 5 | 3 | 1 disk | Good | Moderate | 67–94% |
| RAID 6 | 4 | 2 disks | Good | Lower | 50–88% |
| RAID 10 | 4 | 1 disk per mirror | Excellent | Good | 50% |
RAID is not a backup strategy — it protects against disk failure but not against accidental deletion, ransomware, or site-level events.
Go deeper
Related to this question
Learn chapter
Storage Management (RAID, SAN, NAS)
Key term
USB
USB (Universal Serial Bus) is a standard for connecting peripherals to a host computer, supporting data transfer and power delivery.
Key term
RAID 1
RAID 1 is a data storage method that creates an exact copy of data on two or more drives so that if one fails, your information is safe.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed July 2026 · checked against the official CompTIA exam blueprint
This SK0-005 practice question is part of Courseiva's free CompTIA 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 SK0-005 exam.