We process a large amount of data daily, receiving files every second or minute. We currently move files to another folder or bucket. Is there an optimized solution for this file transfer?

The most efficient way to move large files between S3 locations is to use S3’s native copy operation, which is server‑side and does not transfer data over the network. Trigger an S3 event (PUT) to a Lambda that calls the CopyObject API, optionally using the CopySource header to preserve metadata. For very large objects, use multipart copy or the S3 Batch Operations API to parallelise the transfer. If the source and destination are in different regions, enable S3 Transfer Acceleration or use the S3 Cross‑Region Replication feature, which automatically replicates objects asynchronously. For cost optimisation, consider using S3 Lifecycle policies to transition objects to cheaper storage classes after they are copied, and enable S3 Inventory to audit the copy process. Finally, if the workflow requires transformation, chain the copy Lambda to another Lambda or Step Function that processes the file before moving it to the final bucket. This approach keeps the data transfer inside AWS, reduces egress costs, and scales automatically with the volume of files.