Video Surveillance Storage: How to Size Recording Capacity
Running out of disk space is one of the most common surprises in a video surveillance project. The system may look fine at handover, then overwrite the footage you need weeks later. Video surveillance storage is easy to size when you know the few factors that drive it. This guide walks through them.
Key takeaways
- Storage depends on camera count, resolution, frame rate, compression and retention days.
- Motion-based recording saves space but can miss events if set badly.
- Plan for growth, because more cameras and higher quality are common.
- Decide the retention period with your business and legal needs, then size to it.
What drives storage use
Every camera writes data all day. The size depends on how much detail each frame holds and how many frames are saved.
| Factor | Effect on storage |
|---|---|
| Number of cameras | Each camera adds its own stream |
| Resolution | More pixels mean larger files |
| Frame rate | More frames per second mean more data |
| Compression | Modern codecs shrink files at the same quality |
| Recording mode | Continuous uses more than motion or event recording |
| Retention days | Longer retention needs more capacity |
A simple way to size capacity
Take one camera at the setting you plan to use and note its bitrate from the camera or recorder. Multiply by the number of cameras, then by the seconds in the retention period. Convert to terabytes and add a margin for growth and for disks you keep as spare. Ask your supplier to show this calculation in writing so you can check it.
Continuous, motion and event recording
Continuous recording is simple and complete, but uses the most space. Motion recording saves space in quiet areas, yet a badly tuned setting can skip the moment you need. A common plan is continuous recording on key cameras and event-based recording elsewhere. Compare the choices alongside intelligent video analytics versus basic CCTV if analytics will trigger recording.
Where to store it and how to protect it
Footage can sit on a recorder, on a network storage array or in a server room. Choose redundant disks so one failure does not lose footage, and keep the system on a stable power supply. Back up important clips, and limit who can delete them. For choosing the overall setup, see intelligent video surveillance versus CCTV.
Sizing video surveillance storage with Suraj Informatics
Suraj Informatics provides intelligent video surveillance with storage sized to your cameras and retention needs, and shows the working so you can check it. Contact us to review your recording plan.
Video surveillance storage: common questions
How much storage do I need for CCTV?
It depends on camera count, resolution, frame rate, compression and retention days. Ask for a written calculation based on your settings.
Does motion recording save space?
Yes, in areas with little activity. Test the settings so important events are not missed.
How long should I keep footage?
Set it by your business needs and any legal requirement, then size storage to that period.
What if I add cameras later?
Plan spare capacity at the start, or choose storage that you can expand.
Talk to our video surveillance team
Tell us your camera count and how long you need footage, and we will help size storage.
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