I’m just an early-adopter type otherwise I would write it myself but Syncany seems like the perfect project to partner with. It is an open-source app that does file syncronization with a focus on file versioning, encryption, and file deduplication. It is designed to be storage protocol agnostic. Right now it works with (S)FTP, WebDAV, and Amazon S3 plug-ins. I would love it if I could connect to my own RemoteStorage server with this app.
Instructions on how to do a plug-in: https://github.com/syncany/syncany/wiki/Plugin-development.