The most cost-effective and low-maintenance solution to aggregate S3 data from multiple accounts within the same AWS Region is to use Amazon S3 Same-Region Replication (SRR).
From AWS S3 Documentation:
"S3 Same-Region Replication (SRR) automatically replicates new objects between buckets in the same AWS Region. SRR is commonly used to aggregate logs into a single bucket, simplify data aggregation, and meet compliance requirements."
(Source: Amazon S3 User Guide – Replication Overview)
Key benefits of using SRR for this use case:
Zero operational overhead – No Lambda, scripts, or custom code
Fully managed – AWS handles all replication automatically
Secure and efficient – No data leaves the us-west-2 Region
Supports cross-account replication – With proper IAM roles and permissions
Low-cost – Compared to custom ETL pipelines or Lambda solutions
In contrast:
Option A (Lifecycle policies) do not support copying, only expiration, transitions, or deletions.
Option C (scripts) requires custom scheduling and maintenance, increasing operational overhead.
Option D (Lambda) adds complexity and cost and is not as scalable or hands-off as SRR.
[References:, Amazon S3 User Guide – "Using Same-Region Replication (SRR)", AWS Well-Architected Framework – Cost Optimization Pillar, AWS Best Practices for Data Aggregation and S3 Replication, , , ]
