SAA-C03 Design Resilient Architectures Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  Use AWS DataSync to copy files periodically.

  Why it's wrong here

  AWS DataSync is primarily used for migrating data between on-premises storage and AWS, or between different AWS storage services. While it can replicate data, S3 Cross-Region Replication is more cost-effective and provides native, real-time asynchronous replication without the need to manage infrastructure or schedule sync jobs manually.

• ✓

  Enable S3 Cross-Region Replication on the source bucket.

  Why this is correct

  S3 Cross-Region Replication is the native, AWS-recommended way to handle automated, asynchronous replication of objects between buckets in different regions. It ensures data durability and compliance with disaster recovery policies by keeping a secondary copy of the data in a separate geographic region with minimal latency and no manual intervention.

• ✗

  Create an EventBridge rule to trigger a Lambda function for every upload.

  Why it's wrong here

  While an EventBridge and Lambda architecture could technically copy files, it is complex to implement, prone to errors, and difficult to scale under high load. It would also require manual management of error retries and state, making it significantly less resilient and efficient than the native S3 replication feature provided by AWS.

• ✗

  Use AWS Storage Gateway to replicate local data to S3.

  Why it's wrong here

  AWS Storage Gateway connects on-premises environments to cloud storage. It is not designed to replicate existing objects between two S3 buckets in different regions. Using a gateway for this purpose would introduce unnecessary complexity and latency, whereas S3 native features are optimized for internal bucket-to-bucket data movement and synchronization.