Amazon ECR's replication backfill feature allows users to replicate previously stored container images to configured replication destinations without manual retagging. This expands replication coverage beyond images pushed after replication activation, streamlining operations like regional expansion and disaster recovery validation.
Up to ten backfill jobs can run concurrently with progress and results tracked via APIs, and jobs can be stopped without deleting already replicated images. This functionality is globally available in all AWS Regions supporting Amazon ECR.
Source & further reading
Amazon ECR now supports replication backfill for existing container images ↗Source published 2026-10-26. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.