Which of the following is an advantage of using SNS with SQS?

Utilizing Amazon SNS (Simple Notification Service) with Amazon SQS (Simple Queue Service) facilitates a fan-out architecture, which is a significant advantage. In this setup, a single message published to an SNS topic can be delivered to multiple SQS queues, allowing for a decoupled and scalable event-driven system. This means that different components of an application can subscribe to the same notifications and process them independently.

This fan-out mechanism is particularly beneficial in scenarios where multiple services need to react to the same event, such as a user sign-up notification triggering different workflows for analytics, welcome emails, and other processes. By employing SNS alongside SQS, developers can efficiently distribute messages to various subscribers without tightly coupling the services together, thus enhancing the architecture's scalability and robustness.

On the other hand, options related to backup time, message duplication, and storage capacity do not accurately reflect the core benefits of integrating SNS with SQS. While these services offer numerous features, the fan-out architecture is a distinct and prominent advantage that enables flexible message distribution patterns in cloud applications.