During rolling deploys to our web instances, this is what we use at Loomly to safely deploy our web assets to S3 to be served via Cloudfront. This gem is designed to upload and clean unneeded assets from S3 in a safe manner such that older versions or recently removed assets are kept on S3 during the rolling deploy process. It also maintains a version limit and TTL (time-to-live) on assets to avoid deleting recent and outdated versions (up to a limit) or those that have been recently removed.
