NVR vs Cloud Storage: How Long Should a Business Keep Footage?
Thirty days is the working default for a business, and it is what most insurers and franchise agreements ask for when they specify anything. Eight 4K cameras recording on motion to a 4TB local recorder will usually hold about 30 days. The same eight cameras recording continuously hold closer to 10 days on the same drive.
Retention is the question people answer badly. They pick a number that sounds sensible, buy the drive that came in the bundle, and then discover in week three that an incident from last month has already been overwritten. Storage is arithmetic. Do the arithmetic once at the survey and you never have that conversation.
Why is 30 days the number?
Because that is roughly how long it takes for a problem to surface. Stock shrinkage shows up at a monthly count. A slip and fall claim arrives by letter a few weeks later. An employee dispute becomes formal after HR gets involved. A neighbor asks about a hit and run in the lot once they have given up on finding a witness.
Seven days covers break ins. Thirty days covers everything else that people actually pull footage for. Ninety days is worth having when your insurer, franchisor or a contract says so, and occasionally when a claims process is slow.
What does the storage math look like?
These figures assume 4K cameras at a moderate bitrate with efficient compression, which is what current recorders do. Motion recording assumes a typical commercial site with activity during business hours.
| Setup | Motion recording | Continuous recording |
|---|---|---|
| 4 cameras, 2TB | About 30 days | About 10 days |
| 8 cameras, 4TB | About 30 days | About 10 days |
| 8 cameras, 8TB | About 60 days | About 20 days |
| 8 cameras, 12TB | About 90 days | About 30 days |
| 16 cameras, 8TB | About 30 days | About 10 days |
Three things change these numbers in real life. A camera pointed at a busy road records nearly continuously even in motion mode, because there is always motion. Lower resolution or a lower frame rate stretches retention considerably. And higher frame rates for a register camera, where you want to see hands clearly, eat storage faster than anything else on the system.
Size the drive for the site you will have in two years. Adding capacity later is simple when the recorder has a spare bay and awkward when it does not.
Local recorder or cloud: which should you choose?
| Local NVR | Cloud storage | |
|---|---|---|
| Ownership | The box and the footage are yours | Held by the provider under a subscription |
| Monthly cost | None | Per camera, every month, forever |
| Works without internet | Yes | No |
| Off site copy if the box is stolen | Only with backup | Yes by design |
| Retention limit | The drive size you bought | The plan you pay for |
| Bandwidth needed | Only for remote viewing | Constant upload |
| Typical retention at business cost | 30 to 90 days | 7 to 30 days |
The honest answer for most businesses in the Triangle is both, weighted toward local. Record everything to a recorder in your building, then push only the cameras that matter, usually the register and the main entrance, to cloud backup. That gives you long retention at no monthly cost, and an off site copy of the footage most likely to be needed if the recorder itself is taken.
Cloud only makes sense in two cases: a site with no secure place to put a recorder, and a business with many small locations where a single pane of glass across all of them is worth the subscription.
What about upload speed?
This is the detail that catches people out, especially in older buildings in Durham where the fastest available service is still a modest upload. Cloud recording uses upload bandwidth continuously, per camera. Eight cameras streaming to the cloud can saturate a small business connection and slow the card terminal at the same time.
Before you commit to cloud recording, run a speed test at the busiest hour of your week rather than at 8am on a Sunday. Then ask the provider for the upload rate per camera at the resolution you want. If the two numbers do not leave headroom, record locally and back up selectively.
How should retention be set per camera?
You do not need the same setting everywhere. A sensible split for an eight camera site:
- Entrance and register: higher frame rate, longer retention. These are the clips you will actually pull.
- Sales floor and corridors: standard frame rate, standard retention.
- Exterior overview: motion recording with a sensible detection zone so passing traffic does not record all night.
- Stockroom and office: motion recording, longer retention, because shrinkage is found late.
Set a detection zone on every outdoor camera. Without one, a tree line moving in the wind will fill a drive in a week and bury the clip you need.
Who is allowed to monitor your cameras?
If you are paying a company to watch your cameras remotely, that is regulated activity in North Carolina. The Alarm Systems Licensing Board issues a limited monitoring license for firms that remotely monitor access control or camera systems, alongside the security systems license that covers installing and servicing. Ask any monitoring provider which license they hold.
If you handle card data in a way that puts you in scope for PCI DSS, check what the standard says about retaining records from physical monitoring of sensitive areas. Your payment processor can tell you which requirements apply to your setup.
One practical test
Once your system is live, pick a random moment from three weeks ago and export a clip. Time yourself. If it takes more than five minutes, or you have to call somebody for a password, the system is not finished yet. Our remote viewing and NVR setup page covers how we size storage and set up access so the person who needs the footage can get it without help.