The correct first step to resolve an Azure VM backup failure is to verify that the Azure VM Agent is installed and running on the VM. This is because the Azure Backup service relies on the VM Agent—also called the Windows Guest Agent or Linux Agent—to execute the backup extension, which coordinates snapshot creation and data transfer. If the agent is missing, outdated, or in a non-responsive state, the backup process cannot even initiate, making this the most common root cause of failure. On the AZ-104 exam, this troubleshooting step often appears in scenario-based questions where you must identify the initial action from a list of options; a common trap is jumping to network or storage checks first. Remember the memory tip: “Agent first, backup works best”—always confirm the agent’s heartbeat before diving into deeper diagnostics.
AZ-104 Monitor and Maintain Azure Resources Practice Question
This AZ-104 practice question tests your understanding of monitor and maintain azure resources. 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.
Exhibit
Recovery Services vault > Backup jobs
Job: Backup of vm-app-07
Status: Failed
Error details: "Backup failed because the VM agent is not in a ready state."
Additional note: The VM was created from a custom image.
Based on the exhibit, what should the administrator check first to resolve the backup failure for the Azure VM?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Recovery Services vault > Backup jobs
Job: Backup of vm-app-07
Status: Failed
Error details: "Backup failed because the VM agent is not in a ready state."
Additional note: The VM was created from a custom image.
A
Increase the backup retention period in the vault policy.
Why wrong: Retention affects how long backups are kept, not whether the agent can run the job.
B
Verify that the Azure VM Agent is installed and running on the VM.
Azure VM backups depend on a healthy VM agent so Azure can coordinate snapshot and extension operations. If the job reports that the agent is not in a ready state, the first troubleshooting step is to confirm the agent is installed, running, and up to date. Custom images sometimes miss the agent or contain a broken installation, which causes backup jobs to fail immediately.
C
Move the VM to a different availability zone.
Why wrong: Availability zones affect resilience, but they do not fix a missing or unhealthy VM agent.
D
Change the storage account redundancy to ZRS.
Why wrong: Storage redundancy is unrelated to the VM agent state and will not resolve the backup failure.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Verify that the Azure VM Agent is installed and running on the VM.
The Azure VM backup failure is most commonly caused by the Azure VM Agent (also known as the Windows Guest Agent or Linux Agent) not being installed, outdated, or in a non-responsive state. The backup extension relies on the VM Agent to execute snapshots and coordinate with the Azure Backup service; without a healthy agent, the backup process cannot initiate. Therefore, verifying the agent's installation and status is the first troubleshooting step.
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.
✗
Increase the backup retention period in the vault policy.
Why it's wrong here
Retention affects how long backups are kept, not whether the agent can run the job.
✓
Verify that the Azure VM Agent is installed and running on the VM.
Why this is correct
Azure VM backups depend on a healthy VM agent so Azure can coordinate snapshot and extension operations. If the job reports that the agent is not in a ready state, the first troubleshooting step is to confirm the agent is installed, running, and up to date. Custom images sometimes miss the agent or contain a broken installation, which causes backup jobs to fail immediately.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Move the VM to a different availability zone.
Why it's wrong here
Availability zones affect resilience, but they do not fix a missing or unhealthy VM agent.
✗
Change the storage account redundancy to ZRS.
Why it's wrong here
Storage redundancy is unrelated to the VM agent state and will not resolve the backup failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often jump to storage or networking changes (like redundancy or availability zones) when the real issue is a missing or broken VM Agent, which is a prerequisite for any guest-level operation including backup extensions.
Detailed technical explanation
How to think about this question
The Azure Backup service deploys the IaaSBcdrExtension (for Windows) or SnapshotExtension (for Linux) onto the VM to perform application-consistent snapshots. This extension communicates with the Azure VM Agent via the WireServer endpoint (168.63.129.16) to coordinate snapshot operations. If the agent is stopped, unresponsive, or has a corrupted state file (e.g., C:\Packages\Plugins on Windows), the extension fails to install or run, causing the backup to fail with error codes like 'GuestAgentSnapshotInProgress' or 'SnapshotFailed'.
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
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-104 question in full detail.
Monitor and Maintain Azure Resources — This question tests Monitor and Maintain Azure Resources — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Verify that the Azure VM Agent is installed and running on the VM. — The Azure VM backup failure is most commonly caused by the Azure VM Agent (also known as the Windows Guest Agent or Linux Agent) not being installed, outdated, or in a non-responsive state. The backup extension relies on the VM Agent to execute snapshots and coordinate with the Azure Backup service; without a healthy agent, the backup process cannot initiate. Therefore, verifying the agent's installation and status is the first troubleshooting step.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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