Don't use any cloud connected IP cameras. Run regular CCTV cables to the cameras and terminate it to to an digital NVR that saves as video files. Keep the NVR on a security VLAN with strict network policy (no dialing out) between the security VLAN and your home network. Use a general purpose linux box on your home network to run a file pull to grab files from the NVR and dump them onto a local NAS. Once the files are on your NAS you can do what you want with the recordings, like any kind of data lifecycle you need on the files.