The answer is a managed disk snapshot. This is the correct choice because a snapshot captures a point-in-time copy of a managed disk, creating a read-only, crash-consistent image that exists independently of the original disk’s lifecycle. Unlike a backup or a full VM image, a snapshot is lightweight and can be stored indefinitely, then used later to create a new disk and attach it to the VM for restoration. On the AZ-104 exam, this concept tests your understanding of Azure’s recovery options for managed disks—a common trap is confusing snapshots with export actions or incremental backups, but remember that snapshots are specifically for point-in-time copies that you keep and restore manually. A useful memory tip: think of a snapshot as a “freeze frame” of the disk—it captures the data exactly as it was, without affecting the running VM.
AZ-104 Implement and Manage Storage Practice Question
This AZ-104 practice question tests your understanding of implement and manage storage. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Before changing a managed data disk on a production VM, you want a point-in-time copy that you can keep and restore later if needed. What should you create?
A snapshot captures a point-in-time copy of a managed disk. It is the right choice when you want a recoverable copy before making changes. You can create it for an OS disk or data disk and use it later to restore or create a new disk if the original change does not work as expected.
B
An availability set
Why wrong: An availability set improves service availability, but it does not create a copy of a disk for rollback purposes.
C
A load balancer backend pool
Why wrong: A backend pool distributes traffic to VMs, but it does not preserve disk contents or create recovery copies.
D
A resource lock
Why wrong: A lock can prevent deletion or modification, but it does not capture data in a point-in-time disk image.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A managed disk snapshot
A managed disk snapshot captures a point-in-time, read-only copy of a managed disk. You can use it to restore the VM to that exact state by creating a new disk from the snapshot and attaching it to the VM. Snapshots are independent of the source disk's lifecycle, so you can keep them indefinitely for backup or recovery purposes.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
A managed disk snapshot
Why this is correct
A snapshot captures a point-in-time copy of a managed disk. It is the right choice when you want a recoverable copy before making changes. You can create it for an OS disk or data disk and use it later to restore or create a new disk if the original change does not work as expected.
Related concept
Read the scenario before looking for a memorised answer.
✗
An availability set
Why it's wrong here
An availability set improves service availability, but it does not create a copy of a disk for rollback purposes.
✗
A load balancer backend pool
Why it's wrong here
A backend pool distributes traffic to VMs, but it does not preserve disk contents or create recovery copies.
✗
A resource lock
Why it's wrong here
A lock can prevent deletion or modification, but it does not capture data in a point-in-time disk image.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse a resource lock (which protects against deletion but does not create a copy) with a backup mechanism, or think an availability set provides data redundancy, when in fact only a snapshot or backup service captures a point-in-time copy of the disk.
Detailed technical explanation
How to think about this question
When you create a snapshot of a managed disk, Azure uses a differential copy mechanism that initially captures only the changed blocks since the last snapshot (if incremental snapshots are enabled), reducing storage costs and creation time. Snapshots are stored as managed resources in the same region and can be used to create new managed disks, which can then be attached to VMs for restore or data analysis. For production VMs, it is recommended to stop the VM or ensure application-consistent snapshots to avoid data corruption from in-flight writes.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-104 question in full detail.
Implement and Manage Storage — This question tests Implement and Manage Storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A managed disk snapshot — A managed disk snapshot captures a point-in-time, read-only copy of a managed disk. You can use it to restore the VM to that exact state by creating a new disk from the snapshot and attaching it to the VM. Snapshots are independent of the source disk's lifecycle, so you can keep them indefinitely for backup or recovery purposes.
What should I do if I get this AZ-104 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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