How many days a CCTV archive lasts

The same disk can hold a week of footage or two months. It all depends on five things.

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What it depends on

Five factors

Number of camerasAll cameras record to a shared disk. Twice as many cameras means an archive roughly half as long.
ResolutionThe sharper the picture, the more space each minute of footage takes.
CompressionThe modern H.265 compression takes noticeably less space than the earlier H.264 at the same quality.
Continuous or on motionRecording only when there is motion in the frame saves disk space where nothing happens for long: a warehouse at night, an office at the weekend.
Disk sizeA larger disk or several disks means a longer archive.

Questions

What happens when the disk is full?

The recorder keeps working and writes new footage over the oldest.

How can I extend the archive without buying a disk?

Switch on motion recording on cameras where it makes sense and make sure the cameras record in H.265.

Will an ordinary computer disk do?

Disks designed for round-the-clock recording are made for recorders. It is better to use those.

Who will work out the size needed?

We work it out when selecting equipment — from the number of cameras and how many days of footage you need.