Replication = Automatically copy objects from one bucket to another

Two Types of Replication

1. Cross-Region Replication (CRR)

What: Copy objects from bucket in one region to bucket in another region

Example:

Bucket in eu-west-1 → Copies to → Bucket in us-east-2

Use Cases:

• Compliance: Some laws require data in specific regions
• Lower latency: Users in US access US bucket, users in Europe access EU bucket
• Replication across accounts: Copy from Account A to Account B

2. Same-Region Replication (SRR)

What: Copy objects from one bucket to another bucket in the SAME region

Example:

Bucket in us-east-1 → Copies to → Another bucket in us-east-1

Use Cases:

• Log aggregation: Combine logs from multiple buckets into one
• Live replication: Keep production and test accounts in sync
• Backup within same region