The difference in one sentence
A DVR (digital video recorder) records analogue cameras connected by coaxial cable; an NVR (network video recorder) records IP cameras connected over a network. Hybrid recorders can handle both.
What to check before choosing a recorder
- Channels: how many cameras it supports, with room to grow.
- Resolution support: whether it can record every camera at its full resolution.
- Bandwidth: for NVRs, the total incoming video bandwidth the recorder can handle.
- Drive bays: how many hard drives it takes and the maximum capacity per drive.
- PoE ports: some NVRs power cameras directly, which simplifies small installations.
- App and remote access: a reliable, secure mobile app with user permissions.
Sizing storage
Storage depends on the number of cameras, resolution, frame rate, compression (H.264 vs H.265), how much movement is in the scene, whether you record continuously or on motion, and how many days you need to keep.
Start from the retention you need, which for some Dubai premises types is set by SIRA’s requirements, then calculate drive capacity with a safety margin. Use surveillance-grade hard drives, which are designed for continuous writing.
Keep the recorder healthy
- Place it somewhere ventilated and secure.
- Connect it to a UPS so short power cuts do not interrupt recording.
- Check drive status and test playback regularly.