One of the most common questions we get is simple: how many days of footage will my system actually keep? The honest answer is, it depends — but the factors behind that answer are straightforward once you understand them.

What Determines Your Retention Window

Total storage capacity (the size of the hard drive or cloud plan)
Number of cameras recording at once
Resolution of each camera (higher resolution means larger files)
Frame rate (more frames per second means more data per second)

Change any one of these, and your retention window shifts up or down.

Typical Retention Windows

Most residential systems land somewhere between two weeks and 30 days of footage, while many business systems are sized for 30 to 90 days, depending on the property’s needs and any insurance or compliance requirements. There’s no universal number — it’s a direct result of the math above.

Why Systems Overwrite Footage Early

When storage is undersized for the number of cameras and their resolution, the system fills up faster than expected and starts overwriting older footage sooner than the owner assumed. This is one of the most common — and most avoidable — issues we see: a system that looked fine on paper but was never sized for the actual retention window the property needed.

Local Storage vs. Cloud Storage

Local storage (an NVR or DVR with a hard drive on-site) is a one-time cost and keeps footage entirely on your property, but it’s vulnerable if the recorder itself is damaged or stolen. Cloud storage keeps footage off-site and accessible from anywhere, but usually comes with an ongoing subscription and depends on your internet connection. Many systems today use a mix of both for extra redundancy.

Sizing Storage to the Window You Actually Need

The right approach is to start with the retention window you need — not just what a default package happens to include — and size storage backward from there, accounting for camera count and resolution. A quick conversation about how the footage might be used (day-to-day peace of mind versus insurance-grade evidence) usually makes the right number obvious.

We size storage to match how long you actually need to keep footage, not a generic default. If you’re not sure what your property needs, we’ll walk through it together. Call 613-691-1091, and if your project extends into broader AV or home theatre work, our recommended partner avgeeks.ca is worth a look.