Consumers wishing to add more cameras need to buy extra licenses from the vendor. The exact number varies from vendor to vendor. By default, a NAS comes with support for 1 to 4 IP cameras.
NAS vendors also have extra revenue potential in this segment. Since this feature is not needed by all customers, it often comes as an add-on to the OS. The main requirements in the area include IP camera support (almost all vendors support ONVIF cameras, but, specific model support is always better to make use of all the available features in the camera), ease of use when it comes to live view, recording set up, and access to archived footage. However, for casual surveillance needs of home users, a NAS unit can often double up as a NVR. As mentioned in the introduction, NAS vendors often have dedicated NVR lineups.
The growth has mainly been due to the advent of IP cameras that has resulted in cheaper and easier to install surveillance end points. Network Video Recorders (NVR) have become very popular in the last few years, with hard drive vendors actually releasing hard drives with specific firmware features for this particular market.
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