Cross Region S3 Replication

Question

Hi,

We want to setup cross-region s3 bucket replication for our real-time and near-real-time data as part of our DR setup. If the AWS source region is down, will the replication of object to s3 bucket in the alternate region still work?

What are the other options available if the above set up doesn't work for our use-case considering our RTO requirement of 15 minutes?

Thanks in advance

Praveen Muppala · Answer

**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](https://docs.aws.amazon.com/AmazonS3/latest/userguide/replication-metrics.html)**

### 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](https://docs.aws.amazon.com/AmazonS3/latest/userguide/replication-time-control.html#enabling-replication-time-control)**

You can also explore the AWS documentation on replication metrics and considerations:  **[Replication Metrics and Monitoring](https://docs.aws.amazon.com/AmazonS3/latest/userguide/replication-metrics.html)**

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

Cross Region S3 Replication

Cross-Region S3 Replication During Source Region Downtime

Meeting Your RTO Requirement of 15 Minutes

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