A backend device for providing information for driver assistance functions of vehicles comprising: a plurality of application units (11, 12), which are each designed to provide information for at least one driver assistance function of the vehicle for transmission to the vehicles; and a database for storing information of an environment model; and an interface unit, which is associated with the database and is designed to enable access to information stored in the database, wherein the application units (11, 12) are each connected to the interface unit in order to call up information stored in the database via the interface unit; a data reception unit, which is designed to receive FCD data, more especially trajectory data and/or environment data, from multiple vehicles; and a data processing unit, which is designed to process FCD data received from the data reception unit, to determine features of the environment model, and, on the basis of the determined features, to update the information of the environment model stored in the database; wherein the data processing unit is designed to verify a determination of features performed on the basis of received FCD data of a vehicle by a comparison with the result for determining features on the basis of the received FCD data of at least one other vehicle in order to identify an error in information of the environment model stored in the database; characterised in that the data reception unit is designed, if a fault has been identified by the data processing unit, to instruct at least one of the vehicles to detect and to transmit FCD data at a higher detection rate or with a greater scope of information. a plurality of application units (11, 12), which are each designed to provide information for at least one driver assistance function of the vehicle for transmission to the vehicles; and a database for storing information of an environment model; and an interface unit, which is associated with the database and is designed to enable access to information stored in the database, wherein the application units (11, 12) are each connected to the interface unit in order to call up information stored in the database via the interface unit; a data reception unit, which is designed to receive FCD data, more especially trajectory data and/or environment data, from multiple vehicles; and a data processing unit, which is designed to process FCD data received from the data reception unit, to determine features of the environment model, and, on the basis of the determined features, to update the information of the environment model stored in the database; wherein the data processing unit is designed to verify a determination of features performed on the basis of received FCD data of a vehicle by a comparison with the result for determining features on the basis of the received FCD data of at least one other vehicle in order to identify an error in information of the environment model stored in the database; characterised in that the data reception unit is designed, if a fault has been identified by the data processing unit, to instruct at least one of the vehicles to detect and to transmit FCD data at a higher detection rate or with a greater scope of information.