- A
Azure Blob Storage with AzCopy
Correct. AzCopy can be used to synchronize files between on-premises Windows file servers and Azure Blob Storage, offering features like incremental copy and sync modes. It is the best available option for syncing directly to Blob Storage.
- B
Azure File Sync
Why wrong: Wrong. Azure File Sync is designed to synchronize with Azure file shares (Azure Files), not Azure Blob Storage. While it provides continuous sync for file servers, it does not meet the specified requirement to sync to Blob Storage.
- C
Azure Data Box
Why wrong: Wrong. Azure Data Box is a physical device for large-scale offline data transfer, not suitable for ongoing synchronization of files between on-premises servers and cloud storage.
- D
Azure Storage Explorer
Why wrong: Wrong. Azure Storage Explorer is a graphical tool for managing storage accounts, but it does not provide automated synchronization capabilities.
Which Azure Service Synchronizes Files Between On-Premises Servers and Azure?
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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. A key principle to apply: azCopy. 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.
A company wants to synchronize files between multiple on-premises Windows file servers and Azure Blob Storage for backup and centralized access. Which Azure service BEST enables this?
Quick Answer
The answer is Azure File Sync. This service is the correct choice because it is purpose-built to synchronize files between on-premises Windows file servers and Azure file shares, enabling centralized access, backup, and local caching while maintaining file server compatibility. Although the scenario mentions Azure Blob Storage, Azure File Sync works exclusively with Azure file shares, not Blob Storage, which is a key distinction for the exam. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of hybrid storage services and their specific use cases; a common trap is confusing Azure File Sync with Azure Blob Storage or Azure Backup. Remember that Azure File Sync is for file server sync and caching, while Blob Storage is for unstructured object data. A helpful memory tip: think “Sync for Servers” — if you need to keep on-premises Windows file servers in sync with the cloud, Azure File Sync is the dedicated tool.
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
Azure Blob Storage with AzCopy
AzCopy is a command-line utility designed for copying data to and from Azure Blob Storage, and it supports synchronization features like incremental sync and filtering. While it is not a fully managed continuous sync service, it is the only option among the listed choices that directly addresses the requirement to synchronize files with Azure Blob Storage. Azure File Sync syncs with Azure Files (SMB file shares), not Blob Storage. Azure Data Box is for offline data transfer, and Storage Explorer is a GUI management tool, neither of which provides synchronization.
Key principle: AzCopy
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Azure Blob Storage with AzCopy
Why this is correct
Correct. AzCopy can be used to synchronize files between on-premises Windows file servers and Azure Blob Storage, offering features like incremental copy and sync modes. It is the best available option for syncing directly to Blob Storage.
Related concept
AzCopy
- ✗
Azure File Sync
Why it's wrong here
Wrong. Azure File Sync is designed to synchronize with Azure file shares (Azure Files), not Azure Blob Storage. While it provides continuous sync for file servers, it does not meet the specified requirement to sync to Blob Storage.
- ✗
Azure Data Box
Why it's wrong here
Wrong. Azure Data Box is a physical device for large-scale offline data transfer, not suitable for ongoing synchronization of files between on-premises servers and cloud storage.
- ✗
Azure Storage Explorer
Why it's wrong here
Wrong. Azure Storage Explorer is a graphical tool for managing storage accounts, but it does not provide automated synchronization capabilities.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates assume Azure File Sync can work with any Azure storage type, but it only syncs with Azure file shares (Azure Files). The question specifically mentions 'Azure Blob Storage,' so the correct tool is AzCopy, which supports copy and sync operations to blob storage. Many test-takers mistakenly choose Azure File Sync without reading the storage type carefully.
Detailed technical explanation
How to think about this question
Azure File Sync uses the File Sync agent on Windows Server to register the server with a Storage Sync Service, then creates sync groups that map server endpoints to Azure file shares. Under the hood, it leverages the Azure File Sync cloud tiering feature to intelligently cache frequently accessed files locally while offloading cold data to Azure, reducing on-premises storage costs. In a real-world scenario, this allows a company with multiple branch offices to maintain local file server performance while centralizing backups and enabling remote access via Azure file shares.
KKey Concepts to Remember
- AzCopy
- Azure Blob Storage
- Synchronization
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
AzCopy
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.
Visual reference
Quick reference
Azure Blob Storage Tier Comparison
| Tier | Storage Cost | Retrieval Cost | Latency | Use Case |
|---|---|---|---|---|
| Hot | Highest | Lowest | Immediate | Active data, frequent reads |
| Cool | Lower | Higher | Immediate | Data accessed < once / month |
| Cold | Lower still | Higher | Immediate | Data accessed < once / quarter |
| Archive | Lowest | Highest + rehydration delay | Hours | Long-term compliance retention |
What to study next
Got this wrong? Here's your next step.
Review azCopy, then practise related AZ-900 questions on the same topic to reinforce the concept.
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Describe Azure architecture and services — study guide chapter
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FAQ
Questions learners often ask
What does this AZ-900 question test?
Describe Azure architecture and services — This question tests Describe Azure architecture and services — AzCopy.
What is the correct answer to this question?
The correct answer is: Azure Blob Storage with AzCopy — AzCopy is a command-line utility designed for copying data to and from Azure Blob Storage, and it supports synchronization features like incremental sync and filtering. While it is not a fully managed continuous sync service, it is the only option among the listed choices that directly addresses the requirement to synchronize files with Azure Blob Storage. Azure File Sync syncs with Azure Files (SMB file shares), not Blob Storage. Azure Data Box is for offline data transfer, and Storage Explorer is a GUI management tool, neither of which provides synchronization.
What should I do if I get this AZ-900 question wrong?
Review azCopy, then practise related AZ-900 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
AzCopy
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Last reviewed: Jun 11, 2026
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