The answer is the Archive tier, which is the cheapest Azure storage tier for rarely accessed data. This is correct because Archive offers the lowest storage cost of any Azure Blob Storage tier, but it requires rehydration to a Hot or Cool tier before data can be read—a process that typically takes up to 15 hours, making it ideal for long-term backup, archival, or compliance data where retrieval latency is acceptable. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of Azure storage tier trade-offs between cost and access speed; a common trap is confusing the Cool tier (which is cheaper than Hot but still has near-instant retrieval) with Archive. Remember the key distinction: if you can wait hours, go to Archive for maximum savings. For a memory tip, think “Archive = Asleep” — data is in deep storage and needs time to wake up, but it costs the least to keep it there.
AZ-900 Describe Azure architecture and services Practice Question
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. 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.
Which Azure storage tier should be used for data that is rarely accessed, can tolerate several hours of retrieval latency, and needs to be stored at the lowest cost?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Archive tier
The Archive tier is designed for data that is rarely accessed and can tolerate several hours of retrieval latency, offering the lowest storage cost among Azure Blob Storage tiers. It requires rehydration to a Hot or Cool tier before reading, which typically takes up to 15 hours, making it ideal for long-term backup, archival, and compliance data.
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.
✗
Hot tier
Why it's wrong here
Hot tier is optimized for frequently accessed data at higher storage cost — not for rarely accessed archival data.
✗
Cool tier
Why it's wrong here
Cool tier is for infrequently accessed data with a minimum 30-day retention — cheaper than Hot but not the cheapest option.
✓
Archive tier
Why this is correct
Archive tier is the cheapest storage option for rarely accessed data but requires hours of rehydration before access.
Related concept
Read the scenario before looking for a memorised answer.
✗
Premium tier
Why it's wrong here
Premium tier uses SSD storage for the highest performance — the most expensive option, not for archival.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'rarely accessed' with 'infrequently accessed' and choose Cool tier, forgetting that the Archive tier is the only one that tolerates hours of retrieval latency and offers the absolute lowest cost for truly dormant data.
Detailed technical explanation
How to think about this question
Under the hood, the Archive tier stores data offline on magnetic tape or high-density disk, with a blob rehydration process that changes the tier to Hot or Cool before access; this rehydration can be set to priority (1 hour) or standard (up to 15 hours). A real-world scenario is a financial institution storing 7-year-old transaction logs that must be retained for compliance but are only accessed during audits, where the Archive tier reduces storage costs by up to 80% compared to Cool tier.
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-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Archive tier — The Archive tier is designed for data that is rarely accessed and can tolerate several hours of retrieval latency, offering the lowest storage cost among Azure Blob Storage tiers. It requires rehydration to a Hot or Cool tier before reading, which typically takes up to 15 hours, making it ideal for long-term backup, archival, and compliance data.
What should I do if I get this AZ-900 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.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which Azure storage tier should you use for data that is stored for at least 180 days and is rarely accessed?
easy
A.Hot tier
B.Cool tier
✓ C.Archive tier
D.Standard tier
Why C: The Archive tier is designed for data that is rarely accessed and has a minimum storage duration of 180 days. It offers the lowest storage cost but requires several hours to rehydrate data before it can be read, making it ideal for long-term backup or compliance data that is infrequently needed.
Last reviewed: Jun 11, 2026
Question Discussion
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This AZ-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-900 exam.
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