In short, DVR based CCTV systems are relatively simple set-ups owing to older technology; whereas, NVR based CCTV system are the latest technology, and better for business and complex usage. DVR’s are used with analog CCTV cameras while NVR’s are used with internet protocol (IP) cameras.  In a DVR, the video is encoded and stored in the DVR, whereas with an NVR, this happens in the camera and the videos are then stored in the NVR for remote access. A DVR based security system is usually wired and each camera needs to be connected directly to the DVR. NVR based security systems are wireless and all cameras can be connected to a single network. In a DVR based system, you’ll have to consider extra wiring for recording audio. NVR CCTV systems are highly flexible and easy to scale up when your requirement grows larger.