S3 Storage Classes for Log Archival — Cost-Effective Strategies
A company needs to store archival logs that must be retained for 10 years. The logs are accessed infrequently, but when accessed, retrieval must occur within 12 hours. Which storage class is MOST cost-effective?
⚠ Common exam trap
Watch out — candidates often confuse retrieval time with cost, assuming that any class with faster retrieval is better, but the 12-hour retrieval window explicitly allows the use of the lowest-cost archival tier, making Glacier Deep Archive the correct choice despite its slower retrieval speed.
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
✓
Amazon S3 Glacier Deep Archive
Amazon S3 Glacier Deep Archive is the most cost-effective storage class for archival logs that must be retained for 10 years with infrequent access and a 12-hour retrieval window. It offers the lowest storage cost among S3 classes, with retrieval times typically within 12 hours for standard retrievals, making it ideal for long-term archival data that is rarely accessed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Amazon S3 Glacier Deep Archive
Why this is correct
S3 Glacier Deep Archive is the lowest-cost archival class, with a standard retrieval time within 12 hours, matching the stated access requirement. It suits 10-year retention of infrequently accessed logs where cost minimisation outweighs retrieval speed.
- ✗
Amazon S3 Intelligent-Tiering
Why it's wrong here
S3 Intelligent-Tiering charges a monthly monitoring and automation fee per object, which outweighs savings when access patterns are already known to be infrequent. It is tempting because it auto-moves objects between tiers, and it would be correct for unpredictable or changing access patterns.
- ✗
Amazon S3 Standard
Why it's wrong here
S3 Standard bills at the highest per-gigabyte rate and carries no retrieval latency trade-off, so ten years of rarely touched logs accrue unnecessary cost. It is tempting as the default class, and it would be correct for frequently accessed, latency-sensitive data needing millisecond retrieval.
- ✗
Amazon S3 One Zone-Infrequent Access
Why it's wrong here
One Zone-IA stores data in a single availability zone and is designed for 30-day minimum retention with millisecond retrieval, so it does not match 10-year archival economics. It tempts as an infrequent-access class, but Glacier Flexible Retrieval meets the 12-hour retrieval at lower cost.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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