Cross Region S3 Replication

Hello Sravan,

Thank you for your query. Let me address your concerns regarding S3 cross-region replication and alternate options to meet your RTO requirements.

Cross-Region S3 Replication During Source Region Downtime

If the source AWS region is completely down, replication to the destination region will not work. This is because S3 replication is an asynchronous process managed by the source region. For more details and troubleshooting scenarios, please refer to the AWS documentation: Troubleshooting Replication

Meeting Your RTO Requirement of 15 Minutes

To address your Recovery Time Objective (RTO) requirements in such scenarios, consider the S3 Replication Time Control (S3 RTC): This feature ensures predictable replication of objects, typically within 15 minutes, and provides SLA-backed guarantees for replication. It is ideal for compliance-driven or low-latency use cases.
Learn more about enabling S3 RTC here: S3 Replication Time Control Documentation

You can also explore the AWS documentation on replication metrics and considerations: Replication Metrics and Monitoring

I hope this helps in designing a robust disaster recovery (DR) solution tailored to your requirements.