For security purposes, your video doorbell videos are only stored with your account, which means once you've deleted a video, even accidentally, it's gone. The best way to prevent losing an important video is to download it to your phone or computer. Also keep in mind that, as mentioned above, cloud storage services may automatically delete events after 10 to 60 days, so be sure to check your doorbell camera's cloud storage frequently to avoid missing the window to save or download important videos.