We recently got a Nest cam, and we absolutely love the capabilities it brings to our home. One of the staples of the camera was the capability to record footage and then replay it later. The problem with that is we needed to pay for a subscription, and in my humble opinion, it's a bit pricey.
We really love the Nest Cam in our apartment. I was recently investigating how the Nest cam works from the inside, as I thought I could access the stream directly. The short answer - you can't, because the stream is behind DRM protection.