The aws s3 sync command is slow and painful! I needed a more efficient way to sync to large buckets (prod to dev). Finally settled on RClone: https://rclone.org/docs/
To sync various cloud resources, use the excellent cli tool rclone from https://rclone.org/docs/ For this use case, the need was to sync from Box to an AWS S3 bucket. Install rclone:
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curl https://rclone.org/install.sh | sudo bash
Configure both S3 and Box – for remote name labels I just used “S3” and “Box”: