Velero (formerly Heptio Ark) gives you tools to back up and restore your Kubernetes cluster resources and persistent volumes. You can run Velero with a cloud provider or on-premises.
Step by step guide to export virtual machine running in Google cloud computer engine to your S3 bucket.
s3cmd is a cli utility for s3.
RADOS Gateway is an object storage interface in Ceph. It provides interfaces compatible with OpenStack Swift and Amazon S3.