Stick a External USB Drive or connect a internal SATA 2.5 drive into the bay first. http://www.tonidoplug.com/screenshots.html#galleria/img/toni...

Then you have access to all the files in those drives via the web browser or via iPhone/Android apps.

You also can sync your files to this plug device by installing a client software on other computers (much like dropbox) but your are files are always private and never stored on the cloud.