The answer is a managed disk snapshot. This is the correct choice because a snapshot captures a point-in-time, read-only copy of a managed disk, allowing you to restore the disk to that exact state if a change fails, whereas an image captures the entire operating system and data disks for deploying multiple identical VMs. On the AZ-104 exam, this distinction tests your understanding of backup versus deployment scenarios—snapshots are for individual disk recovery, while images are for VM cloning. A common trap is confusing snapshots with images when the question mentions a single disk backup; remember that images are used for scaling out VMs, not for restoring a single disk. For a memory tip, think “Snapshot saves a single disk state; Image initiates identical instances.”
AZ-104 Implement and Manage Storage Practice Question
This AZ-104 practice question tests your understanding of implement and manage storage. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 attached to a VM, you want a point-in-time copy that can be restored later if the change fails. What should you create?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Managed disk snapshot
A managed disk snapshot is a point-in-time, read-only copy of a managed disk that can be used to restore the disk to that exact state if a change fails. Snapshots are incremental, capturing only the changes since the last snapshot, and they exist independently of the source disk, allowing you to create a new disk from the snapshot for recovery.
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.
✓
Managed disk snapshot
Why this is correct
A snapshot creates a point-in-time copy of a managed disk that you can use later for restore or cloning.
Related concept
Read the scenario before looking for a memorised answer.
✗
Availability set
Why it's wrong here
An availability set improves VM uptime, but it does not capture a disk copy before a change.
✗
Image
Why it's wrong here
A VM image is for creating new VMs, but it is not the best tool for a one-time disk checkpoint.
✗
Resource lock
Why it's wrong here
A resource lock prevents changes or deletion, but it does not create a restorable copy of the disk.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse a snapshot with an image, thinking both serve the same purpose, but an image is used for deployment and includes OS configuration, while a snapshot is a raw disk copy for recovery without any generalization.
Detailed technical explanation
How to think about this question
Azure managed disk snapshots are stored as page blobs in Azure Storage and use an incremental billing model: only the changed blocks since the last snapshot are billed, making them cost-effective for frequent backups. When you create a snapshot, it captures the disk's state at that moment, and you can later create a new managed disk from the snapshot using the `New-AzDisk` PowerShell cmdlet or the Azure portal, then attach it to the VM to replace the failed disk. A subtle behavior is that snapshots are zone-redundant by default if the source disk is in a region that supports availability zones, but they are not automatically replicated across regions unless you copy them manually.
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: Managed disk snapshot — A managed disk snapshot is a point-in-time, read-only copy of a managed disk that can be used to restore the disk to that exact state if a change fails. Snapshots are incremental, capturing only the changes since the last snapshot, and they exist independently of the source disk, allowing you to create a new disk from the snapshot for recovery.
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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