Okay, I am going to jump in here as I actually have a system of 3 indoor cameras and 1 outdoor hardwired camera from Nest (http://nest.com).
My yearly subscription for all 4 cameras is $400. For that I get 10 days of video history, meaning I can pull up the recording for any point in the last 10 days and review it, or even save it to my computer. I can set the cameras to record when it detects motion only or all the time. I have the outdoor camera set to record motion only, and the indoor cameras set to record continuously…although I turn the indoor cameras off on the weekends as there is no reason to record myself walking around the house in my underwear.
Both the indoor and outdoor cameras record audio as well. One of the features I really like is the night vision. The quality of the recordings when there is absolutely no ambient light, ie, my family room in the middle of the night, is amazing.
The outdoor camera is mounted 6.5 feet above the porch landing. As a deterrence measure, the installer advised that I want the camera to be seen.
Whenever someone approaches my front door I receive an alert on my phone and can view the live action immediately. I can even speak to the person at the door if I need to from wherever I am. I can monitor all the cameras in my home at any time from my laptop or phone when I am away. I can even control the cameras remotely, eg, turn them on or off, change the quality of the recording, turn night vision on or off, change the recording schedule for each camera individually, rotate the recording image, etcetera.
As far as ripping the outdoor camera out of the wall is concerned, it is installed in there pretty good so I think it would be a challenge to actually rip it out. Probably much easier to simply smash the camera with a hammer or something, but then, as others have stated, at that point you’re already identified and recorded.
I contemplated getting a system that stored the recordings locally but it would have been (a) costly to set up, (b) time-consuming to manage, and (c) less secure, in my opinion, than cloud-based recordings.