Hello,
You are able to tell Sighthound Video to save all of the videos to a NAS device. It really isn't recommended because if the NAS gets disconnected or unreachable, it will cause issues within Sighthound Video. You can find more information about how videos are managed at the link below:
https://www.sighthound.com/support/managing-your-videoHope this helps. Please let us know if you have any other questions or concerns, thank you!
Regards,
-Kevin