Most of the major blobstores support object versioning:
- Atmos: not supported
- Amazon Glacier: not supported
- Amazon S3: http://docs.aws.amazon.com/AmazonS3/latest/dev/ObjectVersioning.html
- Azure: https://msdn.microsoft.com/en-us/library/azure/hh488361.aspx
- Google Cloud Storage: https://cloud.google.com/storage/docs/object-versioning
- OpenStack Swift: http://docs.openstack.org/developer/swift/overview_object_versioning.html
jclouds could expose this functionality in the portable abstraction. We would need to add provider support in several cases.