Azure Archive Blob Storage Tier
A company stores archival data in Azure Blob Storage. The data is accessed only a few times per year, and retrieval can take up to 15 hours. Which blob access tier minimizes storage costs while meeting these requirements?
Quick Answer
The Archive tier is the correct choice because it is designed specifically for archival data that is accessed only a few times per year and can tolerate a retrieval latency of up to 15 hours, matching the requirement exactly. This tier offers the lowest storage cost among all Azure Blob Storage access tiers, making it optimal for long-term, infrequently accessed data where cost savings outweigh the need for rapid access. On the Microsoft Azure Developer Associate AZ-204 exam, this concept tests your understanding of how to select the appropriate blob access tier based on access patterns and retrieval latency, often appearing in scenario-based questions where the trap is choosing the Cool tier (which has lower retrieval time but higher storage cost than Archive). A key memory tip is to associate “Archive” with “Arctic” — data that is frozen and rarely touched, requiring hours to thaw, just like the 15-hour retrieval window.
⚠ Common exam trap
Candidates often confuse the Cool tier's 'infrequent access' with 'archival access,' failing to recognize that Cool tier still provides millisecond retrieval and higher storage costs, while the Archive tier alone meets the 15-hour retrieval requirement and minimizes storage costs.
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
✓
Archive tier
The Archive tier is the correct choice because it is designed for data that is rarely accessed (a few times per year) and has a retrieval latency of up to 15 hours, which matches the requirement. It offers the lowest storage cost among Azure Blob Storage tiers, making it optimal for long-term archival data where infrequent access and delayed retrieval are acceptable.
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 optimised for frequent access and carries the highest storage cost, so it fails the cost-minimisation requirement. It is tempting because it guarantees immediate retrieval, and would be correct for actively used data, but archival data accessed a few times yearly belongs in Archive.
- ✗
Cool tier
Why it's wrong here
Cool tier targets data accessed infrequently but stored at least 30 days, with millisecond retrieval; it costs more than Archive while offering no benefit here. It is tempting for infrequent access, yet the 15-hour retrieval tolerance and few-times-yearly pattern point to Archive.
- ✓
Archive tier
Why this is correct
Archive tier is the lowest-cost blob tier, designed for data rarely accessed with retrieval latency measured in hours. The stated few-times-per-year access and tolerance of up to 15 hours retrieval match its rehydration model exactly.
- ✗
Premium tier
Why it's wrong here
Premium tier uses high-performance SSD storage for low-latency, transaction-heavy workloads, raising cost rather than minimising it. It is tempting for performance-sensitive scenarios, but archival data accessed a few times per year with 15-hour retrieval tolerance fits Archive tier.
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 |
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Same concept, more angles
1 more way this is tested on AZ-204
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. You need to store terabytes of archival data that must be retained for 10 years. The data is accessed once or twice per year. You need to minimize storage costs. Which Azure Storage tier should you use?
easy- A.Cool
- B.Hot
- ✓ C.Archive
- D.Premium
Why C: The Archive tier is designed for data that is rarely accessed (a few times per year or less) and has a flexible retrieval latency of several hours, making it ideal for long-term retention of terabytes of archival data for 10 years at the lowest storage cost. It offers the lowest per-GB storage price among Azure Blob Storage tiers, directly meeting the requirement to minimize costs for infrequently accessed data.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AZ-204 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-204 exam.