I almost jumped on it but reading the comments I will definitely pass on this one. There is no excuse for this not to be able to save to a NAS on your network and 4GB of storage is nothing.
All a robber needs to do is quickly destroy the camera with a hammer and nobody will ever know who did it. or quickly cover the lens and steal it. The camera would probably not even have time to react and call your phone and then your investment is gone.
Whoever thought of storing the videos on the camera itself is not too bright.