description Amazon S3 Cross-Region Replication Overview
Similar to GCS replication, S3 Cross-Region Replication (CRR) is the gold standard for replicating unstructured data objects across AWS regions. It is incredibly reliable, highly durable, and requires minimal management overhead. It is the definitive choice when your DR requirement is purely about ensuring data objects are available in a secondary geographic location.
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What does Amazon S3 Cross-Region Replication actually copy?
S3 Cross-Region Replication copies S3 objects from a source bucket to a destination bucket in another AWS Region. It can preserve metadata and version IDs when the replication rule and bucket versioning are configured correctly.
Does S3 Cross-Region Replication copy old objects automatically?
Live replication applies to new and updated objects after the rule is created. Existing objects require S3 Batch Replication if you want them copied after the fact.
What has to be enabled before using S3 CRR?
Both the source and destination buckets must have S3 Versioning enabled. S3 also needs an IAM role with permissions to read from the source bucket and replicate into the destination bucket.
Can S3 CRR guarantee fast disaster recovery replication?
Standard CRR is asynchronous, so replication delay can vary. If the workload needs a predictable target, S3 Replication Time Control is the AWS feature tied to a 15-minute replication objective for most new objects.
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