Camera systems rarely fail loudly. They degrade, and the degradation is invisible until the day somebody goes to pull footage and finds there is none.
The failure nobody notices
Recording stops. A disk fails, a camera drops off the network, a channel is disabled during some other work and never re-enabled. Nothing on a screen changes, because the live view still works, and live view is the only thing anyone ever looks at.
This is the single most common serious fault in installed systems, and it is usually months old by the time it is discovered.
The short routine
Confirm every camera is recording, not just showing a live picture. This is the one that matters most and it takes minutes.
Check retention against what you think you have. If it was specified for thirty days, confirm there are thirty days there. Retention drifts when cameras are added or settings change.
Clean the lenses and housings. Dust and cobwebs on a dome cause the infrared bounce that washes out night images, and this is the cheapest possible improvement to picture quality.
Check aim. Cameras get knocked, particularly turrets, and by tradespeople who never mention it. A camera pointing slightly off is still a working camera showing you the wrong thing.
Review night images specifically, in the dark. Daytime images almost always look fine. The problems live at night.
Update firmware, mostly for the security fixes. Confirm remote access still works for the people who need it.
Things that change without anyone deciding to
Vegetation grows into a sightline over a season. New lighting gets installed and changes the exposure. Racking is moved in a warehouse and blocks a view. Somebody parks a trailer in front of a camera and it becomes permanent. None of these are faults, and all of them reduce coverage.
How often
An annual check catches most of it. A quick recording confirmation quarterly catches the one that matters most. Sites where footage is genuinely important should be checking that more often than that, because the cost of finding out late is the whole reason the system exists.
Keep a short record
The value of a maintenance routine is mostly in noticing change, and you cannot notice change without a reference point. A few notes are enough: date, which cameras were checked, what the retention actually was, and anything adjusted.
That record answers the question that otherwise cannot be answered, which is when something started. If retention has fallen from thirty days to eleven, knowing it was thirty in March tells you where to look. Without it you are guessing.
Screenshots are worth more than notes for aim and framing. A saved image from each camera, day and night, makes drift obvious at a glance a year later, when memory is unreliable and a slightly different view looks perfectly normal.
Who does it
It can be an in-house job, and for many sites that is the sensible answer. What matters is that it is somebody’s job rather than everybody’s, because a check that belongs to no one does not happen.
A system that stopped recording in March is not a system, which is why Elite Security sets these checks up at handover rather than leaving them implied. More like this in the blog, and commercial CCTV is where to start.