Quick Answer
The correct choice is Azure Site Recovery with replication of the AKS node VMs and attached disks, because Azure Site Recovery orchestrates continuous replication of Azure Disks at the VM level to a secondary region, enabling a full failover of both the compute and persistent storage within your recovery time objective. This works by replicating the entire AKS node VM, including its attached managed disks, so that when a regional failure occurs, the stateful application’s data is already synchronized and ready to be brought online. On the AZ-305 exam, this scenario tests your ability to distinguish between disaster recovery replication and backup—Azure Site Recovery is designed for active replication and rapid failover, while Azure Backup or Disk Backup are point-in-time solutions that cannot meet a 1-hour recovery window. A common trap is choosing Velero, which is excellent for Kubernetes resource backups but does not natively replicate Azure Disks across regions for DR. Memory tip: think “ASR = Always Sync Replication” for stateful AKS disks, not just backup.
This AZ-305 practice question tests your understanding of design business continuity solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You are designing a business continuity solution for a mission-critical Azure Kubernetes Service (AKS) cluster. The cluster hosts a stateful application that uses Azure Disks for persistent volumes. You need to ensure that the application can be recovered in a secondary region within 1 hour of a regional failure. What should you use to replicate the persistent volumes?
Azure Disk Backup with geo-redundant storage
Why wrong: Disk Backup is for backup, not DR replication.
Azure Backup with disk snapshot policies
Why wrong: Backup does not provide automated failover.
Azure File Sync to replicate the disk content
Why wrong: File Sync is for file shares.
Azure Site Recovery with replication of the AKS node VMs and attached disks
ASR replicates VMs and disks to secondary region.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Azure Site Recovery with replication of the AKS node VMs and attached disks
Option A is correct because Azure Site Recovery can replicate Azure Disks (via VM replication) to a secondary region. Velero can back up AKS resources, but for stateful disks, ASR is more appropriate for DR. Option B is wrong because Azure Backup is for file/VM backup, not disk replication. Option C is wrong because Azure File Sync is for file shares, not disks. Option D is wrong because Azure Disk Backup is for backup, not replication for DR.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Azure Disk Backup with geo-redundant storage
Why it's wrong here
Disk Backup is for backup, not DR replication.
Azure Backup with disk snapshot policies
Why it's wrong here
Backup does not provide automated failover.
Azure File Sync to replicate the disk content
Why it's wrong here
File Sync is for file shares.
Azure Site Recovery with replication of the AKS node VMs and attached disks
Why this is correct
ASR replicates VMs and disks to secondary region.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Identify which AZ-305 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Design business continuity solutions — This question tests Design business continuity solutions — Read the scenario before looking for a memorised answer..
The correct answer is: Azure Site Recovery with replication of the AKS node VMs and attached disks — Option A is correct because Azure Site Recovery can replicate Azure Disks (via VM replication) to a secondary region. Velero can back up AKS resources, but for stateful disks, ASR is more appropriate for DR. Option B is wrong because Azure Backup is for file/VM backup, not disk replication. Option C is wrong because Azure File Sync is for file shares, not disks. Option D is wrong because Azure Disk Backup is for backup, not replication for DR.
Identify which AZ-305 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
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