If redundancy across regions is a requirement for an application, what is the best practice to ensure availability?

Utilizing Azure Traffic Manager with multiple regions is the best practice to ensure availability when redundancy across regions is a requirement for an application. Azure Traffic Manager is a sophisticated DNS-based traffic load balancer that allows you to distribute traffic to services hosted in different Azure regions. This ensures that if one region experiences an outage or is unavailable, Traffic Manager can automatically redirect user requests to another functioning location.

This geographic redundancy not only improves availability but also enhances the performance of your application, as users are directed to the nearest available resource. By leveraging multiple regions, you can protect against regional failures and ensure continuous service delivery.

In contrast, deploying resources in a single region does not offer redundancy and poses a risk; if that region goes down, the application becomes unavailable. Implementing Azure Backup is essential for data protection but does not directly contribute to service availability in terms of redundancy. Lastly, using a single Azure VM does not address the requirement for regional redundancy, leaving the application vulnerable to outages. Thus, the approach of using Azure Traffic Manager with multiple regions directly aligns with the goal of maintaining high availability through redundancy.