IndigoVision offers NVR1.5

The NVR1.5 from IndigoVision is designed to work with IndigoVision's IP-Video technology. The unit has a removable hard disk drive, which can be replaced without interrupting recording. A single disk stores four months of continuous full-frame-rate digital video. The unit has built-in redundant power supplies and network connections, and recordings can be mirrored to multiple NVR's in the network.
For more information about this product, call IndigoVision at 908-315-0288 or visit the company's web site at