Whilst I can't provide you an example for cloud storage, I can for syndicated feeds. ATOM is an example of multiple clients interacting with separate syndicated

Whilst I can't provide you an example for cloud storage, I can for syndicated feeds. ATOM is an example of multiple clients interacting with separate syndicated feed servers. The individual implementations can all differ. The way a client interacts with the server is via the media-type and HATEOAS (via the rel-types).