There are three main types of recording devices for CCTV footage. The DVR and the NVR are discussed below.
To decide which of these you need, you should consider the type of network they are working within, the type and functionality of the cameras, the level of archiving required, how long you will need to retain footage and how often you will want to retrieve it or view it live.
CCTV NVR – Network Video Recorders / Servers
An NVR is a device containing software that records CCTV images on any of various types of storage drive.
NVRs are commonly used in IP CCTV systems and with wireless cameras. They provide the functionality for remote viewing, either on a monitor or a computer or tablet or mobile phone. This is done either via a web browser or an app.
An NVR can also provide additional processing functions.
A great advantage of an NVR is that it can be situated anywhere. That is, not necessarily in the same location as the cameras. This provides obvious security of the data that is captured.
DVR – Digital Video Recorders
DVRs provide recording function for analogue cameras and are connected directly to the cameras. With DVRs the initial processing (encoding and video capture) is done on the recorder rather than on the camera itself.
They can provide some additional functionality such as motion detection and alerts and they can offer remote viewing if the device is connected to the internet.
A hybrid recorder allows old analogue cameras to be retained for use in less critical areas while allowing new generation analogue HD or IP cameras to record on the same recording device.