without cloud and without sd, your only option is to stream to your private nas.
Here are the instructions: https://support.eufy.com/de...

Yes, it's a solution called "cloud storage" with a Basic plan 2.99$/month (for 1 camera) and a Plus plan 9.99$/month (for 10 cameras). Or you can buy an SD Card for local storage. The combination SD Card + Cloud Storage is possible