I have a couple of Xiaomi Yi cams, which out-of-the box stream to a mobile app, don't require a subscription, and will save video locally to an SD card. They ar

I have a couple of Xiaomi Yi cams, which out-of-the box stream to a mobile app, don't require a subscription, and will save video locally to an SD card. They are cheap and cheerful (but you would want to keep them behind a firewall). That said, this hack clearly offers a lot more functionality (I think I will replace my Yi cams with these and relegate them to recording raccoons in my backyard).