In a security system, the answer to "how many days of footage can I go back?" depends on the disk capacity in the recorder and the amount of data the cameras generate.
Factors affecting retention
- Number of cameras: Each camera writes its own stream to disk.
- Resolution and frame rate: Higher values use more space.
- Compression: H.265 usually takes less space than H.264.
- Recording mode: Motion-based recording can significantly reduce disk use compared with continuous recording.
- Scene activity: Busy scenes generate more data.
A simple calculation
Total capacity ≈ number of cameras × bitrate per camera × retention period. Because bitrate depends on camera settings, exact figures should be based on the technical documentation of the models used.
Choosing the right drive
For systems recording 24/7, surveillance-class drives designed for security cameras should be used. Redundant disk configurations can also be considered for critical recordings.
During system design we calculate retention and disk requirements for you and offer options that fit your budget.
