I did exactly this more than a year ago with my iPad app:<p><a href="http://blog.uxproductivity.com/2012/04/30/file-synchronisation/" rel="nofollow">http://blog.uxproductivity.com/2012/04/30/file-synchronisati...</a><p>There's nothing inherent in the Skydrive service that enables this kind of functionality. It's purely a client-side thing. And that means that it can be applied to any cloud storage service.<p>I'm planning on open sourcing my core library for doing this syncing, once I've got support for Google Drive and Skydrive in as well (Dropbox, Box, and WebDAV are already supported). The code also needs a bit of cleaning up.<p>I really wish the industry would stop viewing these kinds of services as special or fundamentally differentiated. 15 years ago lots of people ran FTP servers, and we had neither the compatibility problems caused by different APIs/protocols, nor the chest-thumping of companies like Microsoft and Google about their "Cloud" services that are simply glorified FTP servers.