We’ve updated our API manual and you can download it from Google Code. It provides a files system on top of one cloud or many. The SMEStorage API is what is used to build all our client tools. You can use it to access any of the clouds we support (which is pretty much all of them) and you can use it to import/export between different cloud, in real-time or as a scheduled sync. You can use the API to backup email to any cloud, as it has specific functionality for this, or pretty much anything you can think of.