Depends on the NVR (or video surveillance program/software/app) and it’s options. It would have to support saving the RTSP stream to a NAS like the My Cloud. Unfortunately the Wyze RTSP firmware doesn’t support saving the video stream using FTP or similar.
It may be possible, on some My Cloud models, to use Docker/Portainer. If one can get Docker/Portainer running on a My Cloud one may then be able to install a container running video surveillance program that would record/save the RTSP stream to the My Cloud. Such docker support will likely depend on one’s specific My Cloud model/version.
Docker and Portainer for OS5
https://community.wd.com/t/docker-and-portainer-for-os5/259818
