Why a 4th car? Most people can barely drive one…

Do you need to pay for them? I thought you “earn” them like it is shown in the movies?!

Yes. But I have mixed experience with this. How well it works might depend heavily on your internet speed (up/down) and on the performance of the synology. Overall user experience is a lot slower than any other commercial service.

Synology Photo. Then you even have your own "cloud" storage at home.