A method for retrieving operational data from a wind farm via one or more data hubs is disclosed. Operational data is collected from at least one of the wind turbines of the wind farm at a first data hub at the wind farm. The first data hub initiates transfer of the collected operational data towards a data recipient arranged outside the wind farm, and the operational data is received at the data recipient. The first data hub adds transfer information to the operational data, prior to transferring the operational data towards the data recipient. The added transfer information is transferred along with the operational data, the data recipient thereby receiving the transfer information along with the operational data, thereby enabling the data recipient to back trace a transfer history of the received operational data.