With the information technology element finding its roots in every financial organization and across all industries, strong storage capacity forms the backbone for availability, durability, and scalability. Among these, Amazon S3 is one of the most popular services to meet these needs. As enterprises expand geographically, the need for data replication between locations starts to be felt significantly. Hence, the need arose to develop Cross-Region Replication in Amazon S3, where data replication between one bucket sourced from one AWS region to another bucket in a different AWS region is allowed.

The article will describe how to configure Cross-Region Replication in Amazon S3 using Terraform, an IaC software. It gives a general overview of how to set up SLAs, discusses why one would implement cross-region replication, and shows how to get a proof of concept running.