A 1080p surveillance camera typically uses between 1 and 2 gigabytes of storage space per hour of recorded footage. This can greatly depend on the video compression format used. A 4K camera typically uses between 7 and 10 gigabytes of storage space per hour.
Take a look at our custom-build Video Storage Space Calculator to get an estimate on how much storage space you need based on resolution, frame rate, and compression format of your camera.