A vehicular driving assistance system includes an exterior viewing camera disposed at a vehicle and viewing exterior of the vehicle. Image data captured by the camera is provided to and processed at an electronic control unit (ECU). The ECU performs processing tasks for multiple vehicle systems. The vehicular driving assistance system is operable to wirelessly upload captured image data to the cloud for processing at a remote processor. Processing tasks with a higher priority are determined at the ECU to be higher priority tasks. Responsive to determination at the ECU of a higher priority task, the vehicular driving assistance system (i) processes captured image data at the ECU for the higher priority task and (ii) uploads captured image data to the cloud for processing at the remote processor of processing at the remote processor.