Core concept
Config on source bucket: destination bucket + IAM role. Replicates new objects (existing needs Batch Replication).
Advertisement
How it works
Not synchronous. Typical latency: seconds to minutes. Metadata (tags, ACL) replicated. Storage class configurable.
Advertisement
Trade-offs + gotchas
DR (CRR to different region). Compliance (data locality). Latency (replicate to user regions). Backup account (write-only replication).