How long are CCTV recordings kept?

Two different questions: how long you must keep, and how long you can

The first question is legal and operational: how long must recordings stay available? For some premises the surveillance camera law sets a minimum retention period, which you find in the regulations and from the competent authority, not from technicians or forums. Even if your activity isn’t covered, think practically about when you usually discover a problem. A restaurant owner might spot missing stock at the monthly count, and then needs footage covering that whole period.

The second question is technical: how many days can the current system hold before it starts overwriting old footage? Recorders work in a loop: when the disk is full, the oldest recording is deleted and replaced. That is normal. The trouble starts when the loop is shorter than you think. The aim is for the second answer to exceed the first with a comfortable margin.

What fills the disk? Five factors

Picture each camera as a tap pouring into one tank, the disk. The questions are how much each tap pours, how many are open and for how many hours. Retention is simply the tank size divided by what flows in each day. Five things decide that flow:

• Number of cameras: every extra camera adds a stream. Double the cameras and you roughly double the storage needed.
• Resolution: a sharper picture holds more detail, and detail takes space.
• Frames per second: more frames give smoother motion and bigger recordings.
• Compression: how the camera and recorder compress video decides how small the files get without losing clarity.
• Recording hours: continuous 24-hour recording is very different from recording on motion or during set hours.

Each factor affects the others, which is why “how many terabytes do I need?” has no answer until all five are agreed.

Resolution and frame rate: where clarity really matters

Not every camera needs maximum resolution and frame rate. The till camera in a Riyadh shop needs clear detail of what happens at payment, and the entrance camera needs enough clarity for faces. A camera covering a long aisle in a Dammam warehouse mostly has to show that a person or forklift went past, and a lighter setting may do.

Frame rate works the same way. Fast movement at a till or gate benefits from more frames; a quiet corridor doesn’t. A good engineer sets each camera according to its job, saving a lot of space without losing clarity where it counts. Ask the installer to explain the settings for each group of cameras rather than one figure for the whole system.

If specific technical recording requirements apply to your activity, those come first, before any savings. A licensed business CCTV installer knows how to design around them.

Compression and motion recording: smart savings, with conditions

Modern compression standards in IP cameras shrink video considerably compared with older ones, provided both camera and recorder support them. So a new system with mid-sized disks can keep footage longer than an old one with bigger disks. If you are weighing network against analog, see our guide to IP vs analog cameras.

The scene matters too. Compression works best on calm scenes; constant movement, trees swaying in the wind or changing light take more space. That is why an outdoor parking camera at night, with infrared and image noise, can use more than you expect.

Recording on motion only saves a lot of space in quiet areas, such as a stockroom opened a few times a day. It doesn’t suit every area, and if your activity must record continuously, don’t rely on it. A common middle ground is continuous recording at a lighter setting, with quality stepping up automatically on motion.

A worked example: a restaurant adds cameras a year later

A restaurant in Jeddah installed a handful of cameras and an NVR with one disk, and retention was fine at handover. A year later it opened outdoor seating, added two cameras on the frontage and raised the resolution of the till camera. Nobody changed the disk. Retention dropped noticeably, and the owner only found out when he needed footage from two weeks earlier and it wasn’t there.

The fix is simple. Whenever the number or settings of cameras change, ask the technician to recalculate capacity, and check actual retention on the recorder itself. Most recorders show the oldest recording held: go back to it and look at the date. That tells you the real retention more honestly than any calculation on paper.

Reliability: full or silently failing disks

Space alone isn’t enough. Disks fail, and sometimes recording stops because of a disk error without an obvious alarm. Turn on the recorder’s alerts to your phone or email for disk faults and lost camera signals, and for larger systems ask for redundant disks that protect recording if one fails.

Fit a backup power supply for the recorder and switch: a few minutes of power cut can be enough to lose footage or corrupt files. Keep the recorder somewhere cool and ventilated, because summer heat inside a closed cabinet is one of the main causes of disk failure. A maintenance contract usually includes checking disk health and actual retention.

Cloud storage adds an off-site copy, but it depends on internet speed, comes with a subscription and raises an important question: where is the data stored and who can reach it? Ask clearly before relying on it.

Protecting recordings and handing them over

Stored footage contains images of people, and longer retention means more responsibility to protect it. Decide who can view and who can export, use separate accounts, and never publish clips showing people. If a competent authority asks for a recording, the law governs how it is handed over: export the clip as it is, without editing, and save a copy before the recording loop erases it.

The general requirements are covered in our guide to camera rules for businesses and on the surveillance camera compliance page.