The camera will only upload data if triggered by it's motion detectors and enabled by the phone used is not close.
So if no one is in the house and the zone it covers is not compramised there should be minimal data upload.
However reading reviews it does say the camera generates a event when switching to night vision mode. Mine is connected via a switched mains extension. If someone is in the house it is turned off. Just like a burglar alarm if the house is left empty all you have to do is flick the on switch.