Some time ago police asked for data from my cameras. They did not present a subpoena, but were very open and clear about the purpose (a car has been stolen on t

Some time ago police asked for data from my cameras. They did not present a subpoena, but were very open and clear about the purpose (a car has been stolen on the street next to the building) and the time span (2 AM - 3AM). We looked at the footage together, found nothing and they went away. I could have very well told them that they need a subpoena, but that could easily backfire. I could also have told them that the system is out of order, or even destroy the footage if I had something to hide. You can't do any of the latter if you data is uploaded to a cloud provider. Unfortunately DIY security cameras are usually based on old hardware and lack the AI goodies of new systems (e.g. semantic event detection).