The length of time that CCTV footage can be stored depends on the type of recording device being used. Some CCTV systems can store footage for up to a month, while others can store it for several months or even years. The storage capacity can also vary depending on the resolution and frame rate of the cameras.
For example, a 4 camera 6mp system set on 20fps will record around 1 week on 24/7 recording before it is written over.
