It'd be useful to see more info directly on the homepage. My first questions were about the supported platforms (which are listed only on the downloads page) and also as to what the client apps actually look like and can do (features for the latter seem to only be listed party-way down the FAQ page, the link to which is tucked away in the footer).

Duple is an app that gives you your own private cloud at home in one click. Store, Sync, Backup, Share and Access your files from anywhere. Private and simple. It’s plug and play. Just download the app on your devices, plug any USB key to your internet router, and that's it! You've got your own private Dropbox at home. What makes Duple awesome? -It’s private: Your files are not stored on someone else’s data center, but on your storage. -You own your data. Nobody can access your files except you and the people you choose. -It’s simple: Anyone can use it. Just download the app on your devices, plug any USB to your router, and you're good to go! No complicated installation. -It’s flexible: Since you use your own storage, that means you have full control over the size of your cloud. From 1Gb to 10TB (or more), you decide. -It’s safe: Files are End-to-End Encrypted: it’s ultra secure. The app is in beta at the moment.