A DVR Security Camera is a shortening of the phrase “Digital Video Recorder”, and so in essence is very similar to the TiVo box on your TV. These represent a considerable enhancement over past video recording technology which would have had to have been recorded to analog tapes. Not only in the fact that the quality of the recordings is considerably enhanced, but also in the fact that whereas previously you may have required football pitch sized warehouse to hold all of the backup tapes for the times that you needed to store. With DVR Security Systems that is a moot point, because the recordings are either recorded directly to a massive hard drive which can hold hundreds of hours of recordings, or they are routed to a box which connects directly to a cloud storage setup on the web, which can hold an infinite amount of hours!
The other big benefit to this is that whilst analog tapes can and do corrode over time, that the same is not true of digital recordings. If you go back to look at the recordings in ten days or ten years then with a DVR Security Camera having done the recording you can feel reassured that it will look exactly the same.
However with analog tapes you have to be mindful of such factors as how the tapes are stored, whether the conditions are damp, and how closely packed together the tapes are in the warehouse. And on top of all that you have to find the tape in the first place! Which if it was from many years ago (possible with certain types of government surveillance of buildings for example, because they may want to store recordings for years) then you could well have to spend an entire day simply hunting for the right time segment. However, when the recordings are stored digitally, all of these problems evaporate, because you can simply search in the same way that you might search on Google for the clip and find it in seconds.
The image quality is a big benefit of DVR Security Cameras over their analog brothers, because whilst some government departments might keep tapes for years. In practice with most commercial uses for security cameras, it used to be the case that there would be a set of tapes in constant use, with one for each day of the week, one to record the end of the week and one to record each month.
And these would then be recorded over time and time again in a rolling fashion, the effect of which would be to gradually lessen the recording quality of the recordings, and also place a burden on the mechanic of the machine. This is yet another problem that disappears as you move over to a DVR Security Camera System and are able to record digitally, without quite so many points of failure and with the ability to immediately find the security clip that you need.