Security cameras generate a lot of video, and the recorder's hard drives decide how far back you can look. Running out of storage earlier than expected is one of the most common surprises in a new system, so it is worth doing the math at the planning stage.
The basic calculation
Each camera records at a bitrate, measured in megabits per second. A typical modern camera recording around 4 megabits per second continuously uses roughly 40 to 45 gigabytes per day. Eight cameras at that rate would use about 350 gigabytes a day, so 30 days of continuous recording would need in the neighbourhood of 10 terabytes.
Real numbers vary with resolution, frame rate, scene activity and compression, so treat this as an estimate to plan from.
What changes the number
- Resolution: higher-resolution cameras produce more data
- Compression: H.265 generally needs less storage than H.264 at similar quality
- Frame rate: more frames per second means more data
- Recording mode: motion-triggered recording uses far less space than continuous recording, though continuous recording is safer when you need complete footage
- Number of cameras
How long should you keep footage?
There is no single answer. Many businesses choose 30 days or more, and some have their own policies or insurance requirements. If you record people, privacy rules may apply to how video is collected, secured, kept and disposed of, and signage is often expected. For your own situation, check with an adviser.
Local recording versus cloud
Local recorders keep your footage on-site and avoid monthly fees, but they can be lost in a break-in or fire if they are not protected. Cloud storage keeps copies off-site but costs an ongoing fee and uses bandwidth. Some systems combine both. Our video surveillance service can plan the right storage for your cameras.
Planning a project in Newmarket or the Greater Toronto Area? Contact Pitbull Security Solutions or call 888-963-5633 for a free consultation.