A data synchronisation system automating content adaptation and transfer between storage devices and content servers, independent of user device. Included is a data storage device, a synchronisation device that uploads, downloads and processes content data, a control server handling connection data and capability data, controlling the synchronisation device, and at least one content server. The synchronisation device communicates with the data storage device, accesses a device identifier, and connects to the control and/or content server. The control server processes the device identifier and sends connection and capability data to the synchronisation device, which processes the connection and capability data, establishes a connection with the content server based thereon, and performs at least one of downloading and adapting content data to a data storage device format, and uploading same to the data storage device; and of downloading and adapting content data for compatibility with, and uploading to, the destination content server.