Same-Region Replication (SRR) and Cross-Region Replication (CRR) can be configured at the S3 bucket level, a shared prefix level, or an object level using S3 object tags - Amazon S3 Replication (CRR and SRR) is configured at the S3 bucket level, a shared prefix level, or an object level using S3 object tags. You add a replication configuration on your source bucket by specifying a destination bucket in the same or different AWS region for replication.

S3 lifecycle actions are not replicated with S3 replication - With S3 Replication (CRR and SRR), you can establish replication rules to make copies of your objects into another storage class, in the same or a different region. Lifecycle actions are not replicated, and if you want the same lifecycle configuration applied to both source and destination buckets, enable the same lifecycle configuration on both.

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Object tags cannot be replicated across AWS Regions using Cross-Region Replication - Object tags can be replicated across AWS Regions using Cross-Region Replication. For customers with Cross-Region Replication already enabled, new permissions are required for tags to replicate.

Once replication is enabled on a bucket, all old and new objects will be replicated - Replication only replicates the objects added to the bucket after replication is enabled on the bucket. Any objects present in the bucket before enabling replication are not replicated.

Replicated objects do not retain metadata - You can use replication to make copies of your objects that retain all metadata, such as the original object creation time and version IDs. This capability is important if you need to ensure that your replica is identical to the source object.