Quick Answer
The answer is the Archive tier. This is the correct choice because it offers the absolute lowest storage cost of any Azure Blob Storage access tier, making it the most cost-effective option for long-term backup data that must be retained for 7 years with rare access. The Archive tier is specifically designed for such scenarios, where retrieval latency of up to 15 hours is acceptable, prioritizing minimal storage expense over immediate availability. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of how access tiers map to business requirements, often appearing as a scenario where you must balance cost against retrieval speed. A common trap is choosing the Cool tier, which is cheaper than Hot but still more expensive than Archive for data accessed less than once a year. Remember the memory tip: “Archive for the archive”—if data is rarely touched and must be kept for years, Archive is the cheapest vault.
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.
A company needs to store backup data that must be retained for 7 years. They want to store the data as cheaply as possible, and access may be rare. Which Azure Storage access tier is most cost-effective?
Hot tier
Why wrong: Hot tier is for frequently accessed data; it has higher storage costs.
Cool tier
Why wrong: Cool tier is for infrequently accessed data but still has moderate cost.
Archive tier
Archive tier offers the lowest storage cost for data that is accessed rarely, with retrieval taking hours.
Premium tier
Why wrong: Premium tier is for high-performance scenarios, not cost-effective for backups.
Answer choices
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 the most cost-effective option for data that must be retained for 7 years with rare access. It offers the lowest storage cost among Azure Blob Storage access tiers, specifically designed for long-term retention where retrieval latency of up to 15 hours is acceptable. This aligns perfectly with the requirement to minimize cost while meeting the 7-year retention period.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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 for frequently accessed data; it has higher storage costs.
Cool tier
Why it's wrong here
Cool tier is for infrequently accessed data but still has moderate cost.
Archive tier
Why this is correct
Archive tier offers the lowest storage cost for data that is accessed rarely, with retrieval taking hours.
Related concept
Read the scenario before looking for a memorised answer.
Premium tier
Why it's wrong here
Premium tier is for high-performance scenarios, not cost-effective for backups.
Common exam traps
The trap here is that candidates often confuse 'cheapest storage cost' with 'cheapest overall cost,' overlooking the high retrieval costs and rehydration latency of the Archive tier, or they mistakenly choose Cool tier because it sounds 'cool enough' for rare access without considering the 7-year retention requirement.
Trap categories for this question
Scenario analysis trap
Premium tier is for high-performance scenarios, not cost-effective for backups.
Detailed technical explanation
Under the hood, the Archive tier stores data offline in Azure Blob Storage, requiring a rehydration process (changing the tier to Hot or Cool) before reading, which can take up to 15 hours. The storage cost for Archive is typically about 80-90% less than Hot, but retrieval costs are significantly higher, and there is a 180-day early deletion penalty. In a real-world scenario, a company might use lifecycle management policies to automatically move backup data from Cool to Archive after 30 days, balancing initial accessibility with long-term cost savings.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
The correct answer is: Archive tier — The Archive tier is the most cost-effective option for data that must be retained for 7 years with rare access. It offers the lowest storage cost among Azure Blob Storage access tiers, specifically designed for long-term retention where retrieval latency of up to 15 hours is acceptable. This aligns perfectly with the requirement to minimize cost while meeting the 7-year retention period.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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