DEA-C01 Data Store Management Practice Question
Which THREE of the following are best practices for managing data storage costs in Amazon S3? (Choose 3.)
⚠ Common exam trap
A common trap is overlooking S3 Object Lock with lifecycle expiration as a cost management best practice. Object Lock is often seen solely as a compliance feature, but when paired with lifecycle policies, it ensures data is retained only as long as needed and then expires, directly impacting storage costs. The actual best practices for cost management include lifecycle transitions (Option B), Object Lock with lifecycle policies (Option C), and Intelligent-Tiering (Option E).
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
✓
Use S3 Lifecycle policies to transition objects to S3 Glacier Deep Archive after a specified period.
S3 Lifecycle policies allow you to automatically transition objects to lower-cost storage classes like S3 Glacier Deep Archive after a specified period, reducing storage costs for infrequently accessed data. Option C is correct because combining S3 Object Lock with a lifecycle policy to expire objects after the retention period ensures that objects are automatically deleted when they are no longer needed, preventing unnecessary storage costs. Option E is correct because S3 Intelligent-Tiering automatically moves data between access tiers based on changing patterns, optimizing costs without manual intervention. Options A and D are not best practices for cost management: storing all data in S3 Standard is costly, and creating multiple replicas increases storage costs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Store all data in S3 Standard for maximum durability.
Why it's wrong here
Storing all data in S3 Standard is not a best practice for cost management; it ignores cost savings from lower-cost storage classes for infrequently accessed data.
- ✓
Use S3 Lifecycle policies to transition objects to S3 Glacier Deep Archive after a specified period.
Why this is correct
S3 Lifecycle policies automatically transition objects to cheaper storage classes like S3 Glacier Deep Archive, reducing costs for infrequently accessed data—a key cost management practice.
- ✓
Use S3 Object Lock to prevent object deletion and then apply a lifecycle policy to expire objects after a retention period.
Why this is correct
S3 Object Lock prevents deletion, and when combined with a lifecycle policy to expire objects after a retention period, it ensures data is deleted when no longer needed, helping manage storage costs.
- ✗
Create multiple bucket replicas in different regions to ensure availability.
Why it's wrong here
Creating multiple bucket replicas in different regions increases storage and data transfer costs, which is not a cost-saving practice.
- ✓
Enable S3 Intelligent-Tiering for data with unknown or changing access patterns.
Why this is correct
S3 Intelligent-Tiering automatically moves data between access tiers based on changing access patterns, optimizing costs without manual intervention—a recommended cost management practice.
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
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services 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 DEA-C01 exam.