The present invention relates to a streaming apparatus, and a method in a network system, comprising at least a first and a second streaming apparatus (1001, 1002) for data streaming, each being adapted to upload and store media data, comprising a plurality of media data compositions, for example representing movies and/or TV channels, the network system further comprising a plurality of user devices (11). The method comprises the first streaming apparatus (1001) receiving a plurality of streaming requests from a plurality of the user devices (11), the first streaming apparatus (1001) determining whether to stream media data compositions according to the streaming requests, sending, if the first streaming apparatus (1001) determines not to stream a media data composition, the corresponding streaming request to the second streaming apparatus (1002), the first streaming apparatus (1001) creating request information related to streaming requests received by the first streaming apparatus (1001), and the first streaming apparatus (1001) determining, based at least partly on the request information, whether to upload and store a further media data composition (Mnpq).