SAA-C03 Design Resilient Architectures Practice Question
A media company stores original uploads in an S3 bucket. They must recover from accidental overwrites/deletes and also recover quickly from a full Region outage. The required RPO is about 1 hour. Which configuration best meets these requirements?
⚠ Common exam trap
AWS often tests the misconception that CRR can work without versioning, but the S3 API explicitly requires versioning on the source bucket for replication to function, and candidates may overlook that versioning is also the mechanism that protects against accidental overwrites and deletes.
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
✓
Enable S3 versioning and configure cross-Region replication to a bucket in another Region.
Enabling S3 versioning protects against accidental overwrites and deletes by preserving all object versions, while cross-Region replication (CRR) asynchronously replicates objects to a bucket in another Region, providing recovery from a full Region outage. With versioning enabled, CRR replicates both current and previous object versions, meeting the ~1-hour RPO (typically within minutes for new objects) and ensuring data durability across Regions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable an S3 lifecycle policy to transition objects to Glacier after 7 days without enabling versioning.
Why it's wrong here
An S3 lifecycle policy that transitions objects to Glacier after 7 days reduces storage costs for archived data, but it does not create a copy or preserve multiple versions. If an object is overwritten or deleted in the S3 bucket, the Glacier transition also applies to that current object, and the original content is gone. Lifecycle management addresses storage tiering, not data recovery from logical corruption or accidental deletion.
When this WOULD be correct
A company needs to archive old data to reduce costs, has a separate backup strategy for disaster recovery, and can tolerate retrieval times of hours for data older than 7 days.
- ✗
Enable S3 cross-Region replication (CRR) but leave the bucket without versioning enabled.
Why it's wrong here
Cross-Region Replication requires versioning to be enabled on the source bucket, so leaving it disabled will cause the replication rule to fail or work incorrectly. Even if replication were configured, without versioning there is no retained history of object modifications, so accidental overwrites or deletes cannot be undone. Thus, this approach neither meets the prerequisite for CRR nor provides the needed recovery capability.
When this WOULD be correct
A company needs to replicate objects to another Region for low-latency access or compliance, but does not require protection against accidental deletion or overwrite. Versioning is not needed because the source bucket is append-only or objects are immutable.
- ✓
Enable S3 versioning and configure cross-Region replication to a bucket in another Region.
Why this is correct
Enabling S3 versioning preserves every version of an object, allowing retrieval of prior versions if an object is accidentally overwritten or deleted. Cross-Region Replication (CRR) asynchronously copies objects to a bucket in another Region, protecting against a Regional disaster. Because CRR requires versioning on both source and destination buckets, this combination satisfies both logical protection and geographic redundancy.
- ✗
Rely on frequent EBS snapshots of a temporary cache used during uploads.
Why it's wrong here
EBS snapshots are used to back up Amazon Elastic Block Store volumes attached to EC2 instances; they do not interact with S3 object storage. A temporary cache on an EC2 instance is not the authoritative source for the media files, and its snapshots would not capture S3 object versions or deletions. Relying on this approach gives no ability to recover original S3 uploads and wastes resources on irrelevant backups.
When this WOULD be correct
This would be correct if the question asked about recovering an EC2 instance's root volume or data volume after a failure, with RPO of 1 hour, and the uploads were temporarily cached on an EBS volume before being moved to S3.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓Enable S3 versioning and configure cross-Region replication to a bucket in another Region.Correct answer▾
Why this is correct
Enabling S3 versioning preserves every version of an object, allowing retrieval of prior versions if an object is accidentally overwritten or deleted. Cross-Region Replication (CRR) asynchronously copies objects to a bucket in another Region, protecting against a Regional disaster. Because CRR requires versioning on both source and destination buckets, this combination satisfies both logical protection and geographic redundancy.
✗Enable an S3 lifecycle policy to transition objects to Glacier after 7 days without enabling versioning.Wrong answer — click to see why▾
Why this is wrong here
Without versioning, the lifecycle policy cannot protect against accidental overwrites or deletes, and Glacier transition does not provide quick recovery from a full Region outage (RPO ~1 hour).
★ When this WOULD be the correct answer
A company needs to archive old data to reduce costs, has a separate backup strategy for disaster recovery, and can tolerate retrieval times of hours for data older than 7 days.
Why candidates choose this
Candidates may think that transitioning to Glacier provides a low-cost backup, but they overlook that versioning is required for recovery from accidental changes and that Glacier retrieval is too slow for a 1-hour RPO.
✗Enable S3 cross-Region replication (CRR) but leave the bucket without versioning enabled.Wrong answer — click to see why▾
Why this is wrong here
Without versioning, S3 cross-Region replication cannot protect against accidental overwrites or deletes because replication only copies the current version; deleted or overwritten objects are not recoverable.
★ When this WOULD be the correct answer
A company needs to replicate objects to another Region for low-latency access or compliance, but does not require protection against accidental deletion or overwrite. Versioning is not needed because the source bucket is append-only or objects are immutable.
Why candidates choose this
Candidates may think CRR alone provides disaster recovery, overlooking that versioning is essential for recovering from user errors like overwrites and deletes.
✗Rely on frequent EBS snapshots of a temporary cache used during uploads.Wrong answer — click to see why▾
Why this is wrong here
EBS snapshots are for EC2 instance volumes, not for S3 data. They cannot protect against accidental overwrites/deletes in S3, nor do they provide cross-Region recovery for S3 objects.
★ When this WOULD be the correct answer
This would be correct if the question asked about recovering an EC2 instance's root volume or data volume after a failure, with RPO of 1 hour, and the uploads were temporarily cached on an EBS volume before being moved to S3.
Why candidates choose this
Candidates may confuse EBS snapshots as a general backup mechanism for any data, or think that since uploads pass through a cache, snapshots of that cache can protect the data.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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 |
Go deeper
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SAA-C03 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 SAA-C03 exam.