A media company stores video files in Amazon S3 buckets organized by content type. The company has a requirement to automatically archive files that are older than 90 days to Amazon S3 Glacier Deep Archive to reduce costs. However, the company wants to retain the ability to restore files within 12 hours if needed. The data engineer creates an S3 Lifecycle policy to transition objects to Glacier Deep Archive after 90 days. After deploying the policy, the engineer notices that the storage costs have not decreased significantly. On reviewing the bucket metrics, the engineer sees that many objects are being deleted directly by users before the lifecycle policy takes effect. The company needs to enforce the lifecycle policy and prevent premature deletions. What should the data engineer do to enforce the lifecycle policy?

Question

Accepted Answer

Enable S3 Versioning on the bucket and add a lifecycle rule to transition noncurrent versions to Glacier Deep Archive after 90 days.. Enabling S3 Versioning ensures that when users delete objects, a delete marker is created instead of permanently deleting the object. The lifecycle rule can then transition the noncurrent versions (the original objects) to Glacier Deep Archive after 90 days, preserving the data while reducing costs. Option A is incorrect because Object Lock with GOVERNANCE mode prevents any deletion or overwrite for the retention period, which may interfere with normal operations and does not address the lifecycle policy enforcement. Option C is incorrect because MFA Delete provides additional security for delete operations but does not prevent the deletion itself; it only requires MFA authentication. Option D is incorrect because S3 Glacier Select is used to query archived data, not for lifecycle management.

Answer

Apply an S3 Object Lock retention policy with a default retention mode of GOVERNANCE and a retention period of 90 days.

Answer

Enable S3 Multi-Factor Authentication (MFA) Delete on the bucket to require MFA for all delete operations.

Answer

Use S3 Glacier Select to query the objects and restore them if needed.

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

DEA-C01 Data Store Management Practice Question

Why each option matters

Option-by-option breakdown

AWS S3 Storage Class Comparison

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