The Promise SmartStor NS4600 4-bay network-attached storage (NAS) device can provide up to 8TB of storage for the home or a small business. It performed well in our file transfer tests and has an attractive design. However the configuration software and Web interface are difficult to use and its backup options could be improved. The Promise SmartStor NS4600 is certainly one of the sleeker looking NAS devices we've seen, with rounded edges and a glossy black case. Neon blue LEDs indicate disk power and operation, as well as network and general activity. The only physical button on the SmartStor's front panel initiates the scheduled Snapshot one-touch backup function, which provides up to four restore points on a specified volume.