A 4TB NVR can support four, eight, or sixteen cameras, depending on its channel configuration. The 4TB capacity affects how long video recordings can be stored, with retention varying by camera resolution, recording settings, and activity.

A 4TB NVR’s recording time depends on the number of cameras, resolution, frame rate, compression settings, and whether recording runs continuously or only when motion occurs. Higher-resolution cameras and continuous recording use storage faster, while motion-based recording can extend retention, so review the system’s recording settings to estimate the required storage period.

On a 4TB NVR, higher camera resolutions, faster frame rates, higher bitrates, and continuous recording use storage more quickly, while lower settings and motion-based recording can extend retention. The number of cameras, compression format, recording schedule, and use of multiple streams also affect how long video remains available.

When comparing 4TB NVRs, check channel capacity, built-in Power over Ethernet (PoE) port count and budget, incoming and outgoing bandwidth, and whether the unit has one or two network interfaces for separating camera traffic from the main network. For storage expansion, review the number of SATA bays and supported drive capacity, since options range from a single drive expandable to 10TB to two-bay designs supporting up to 18TB per drive.