You can build your own LAN system. You just need to plug a camera with a wide lens into a Pi, optionally with a PIR motion sensor. Possibly with some IR illumination for night vision.Have some code which motion triggers the camera (either in software or IR triggered) and upload the data to your own storage. That could be local on a NAS or cloud (a bucket you own).
I suggest this over an IP camera as you might as well be paranoid about those too. If you need live streaming that can be done with open source software fairly easily.
You would have to spend some time working on hardware, and it'd probably cost more, but technically it's just tedious rather than difficult. There are some projects to do this with the Pi camera already. You could even add object detection with ML quite easily, which is something you pay a lot for with other platforms.
What you miss out on is the level of embedded and mechanical integration that the commercial stuff has. Blink has a two year battery life (replaceable), the housings are IP rated etc.
I suggest this over an IP camera as you might as well be paranoid about those too. If you need live streaming that can be done with open source software fairly easily.
You would have to spend some time working on hardware, and it'd probably cost more, but technically it's just tedious rather than difficult. There are some projects to do this with the Pi camera already. You could even add object detection with ML quite easily, which is something you pay a lot for with other platforms.
What you miss out on is the level of embedded and mechanical integration that the commercial stuff has. Blink has a two year battery life (replaceable), the housings are IP rated etc.