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Hello ayanivas,
Thanks for taking the time to share your feedback on this question. We completely see your point and value your input.
Your concern about resiliency is valid because S3 Standard-IA stores data across multiple Availability Zones, while S3 One Zone-IA stores data in a single Availability Zone.
The key detail in the scenario is that the files are described as “easily reproducible.” According to AWS, S3 One Zone-IA is suitable for infrequently accessed data that can be recreated if the Availability Zone becomes unavailable. It also provides the required millisecond retrieval time, just like S3 Standard-IA, but at a lower storage cost.
Because the question asks for the most cost-effective solution, the tdojo-finance files can be moved to S3 One Zone-IA after the first month. The lower resiliency is acceptable in this case because the files can be recreated. The remaining files can be transitioned to S3 Glacier because they are rarely accessed and there is no specific retrieval-time requirement.
Therefore, the correct answer is: Store the files in S3, then after a month, transition the tdojo-finance prefix to S3 One Zone-IA, while transitioning the remaining files to S3 Glacier using a lifecycle policy.
If the scenario had stated that the files must remain available during an Availability Zone failure, or that they could not be recreated, then S3 Standard-IA would have been the better choice.
I hope that answers your query. Feel free to reach out if you have any follow-up questions!
Regards,
Lois @ Tutorials Dojo
