The answer is Azure Blob Storage with lifecycle management policies. This is correct because lifecycle management allows you to define rule-based actions that automatically transition blobs from the hot tier to the cool tier after 30 days and then to the archive tier after 90 days, directly meeting the cost-minimization requirement for rarely accessed files that must be retained. On the Microsoft Azure Solutions Architect Expert AZ-305 exam, this scenario tests your understanding of storage tier automation and cost optimization strategies, often appearing as a design question where you must choose between manual tiering, Blob Storage lifecycle policies, or Azure File Sync. A common trap is selecting Azure Cool Blob Storage alone, which lacks the automated transition logic needed for multi-tier cost savings. Memory tip: think of lifecycle policies as a “three-step escalator” — Hot, Cool, Archive — with each step triggered by age, not access.
AZ-305 Design data storage solutions Practice Question
This AZ-305 practice question tests your understanding of design data storage 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.
A media company stores raw video files and processed output in Azure. These files are accessed via REST APIs by a processing application. After processing, the files are rarely accessed but must be retained. To minimize costs, the company wants to automatically move files to a cheaper storage tier after 30 days and archive them after 90 days. Which Azure storage solution and feature should they use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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 lifecycle management policies
Azure Blob Storage with lifecycle management policies is correct because it allows you to define rules that automatically transition blobs from the hot tier to the cool tier after 30 days and then to the archive tier after 90 days. This directly meets the cost-minimization requirement for rarely accessed files that must be retained, as lifecycle management automates tier transitions without manual intervention.
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.
✓
Azure Blob Storage with lifecycle management policies
Why this is correct
Blob Storage offers multiple tiers and lifecycle management can automate tier transitions (e.g., cool after 30 days, archive after 90 days).
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Files with snapshot schedules
Why it's wrong here
Azure Files supports snapshots for backup, not automated tiering between storage tiers.
✗
Azure Disk Storage with incremental snapshots
Why it's wrong here
Disk Storage is for VM disks and snapshots are for backup, not tiering of file-based data.
✗
Azure NetApp Files with snapshot policies
Why it's wrong here
NetApp Files provides performance optimization but does not have built-in tiering to archive for cost optimization.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse Azure Files or Azure NetApp Files with object storage, not realizing that only Azure Blob Storage supports REST API access and automated lifecycle tiering to cool and archive tiers.
Detailed technical explanation
How to think about this question
Lifecycle management policies in Azure Blob Storage use rules defined in JSON or via the Azure portal, supporting actions like 'tierToCool' after 30 days and 'tierToArchive' after 90 days, based on the 'lastModified' or 'creationTime' property. Under the hood, the archive tier has a 180-day early deletion penalty if data is deleted before that period, which is critical for cost planning. In real-world scenarios, media companies often combine lifecycle policies with blob index tags to filter specific files (e.g., raw vs. processed) for granular tiering.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-305 question in full detail.
Design data storage solutions — This question tests Design data storage solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Blob Storage with lifecycle management policies — Azure Blob Storage with lifecycle management policies is correct because it allows you to define rules that automatically transition blobs from the hot tier to the cool tier after 30 days and then to the archive tier after 90 days. This directly meets the cost-minimization requirement for rarely accessed files that must be retained, as lifecycle management automates tier transitions without manual intervention.
What should I do if I get this AZ-305 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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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