Network-attached storage (NAS) with the properties of improved scalability, simplified management, low cost and balancedprice-performance, is desirable for high performance storage systems applied to extensive areas. Unfortunately, it also has some dis-advantages such as increased network workload, and inconvenience in disaster recovery. To overcome these disadvantages, we pro-pose a channel-bonding technique and provide hot-backup functions in the designed NAS system, named HUSTserver. Channel bondingmeans merging multiple Ethernet channels into integrated one, and that the data packets can be transferred through any available net-work channels in a parallel mode. The hot-backup function provides automatic data mirroring among servers. In this paper, we firstdescribe the whole system prototype from a software and hardware architecture view. Then, multiple Ethernet and hot-backup tech-nologies that distinguish HUSTserver from others are discussed in detail. The findings presented demonstrate that network bandwidthcan be scaled by the use of multiple commodity networks. Dual parallel channels of commodity 100 Mbps Ethernet are both necessaryand sufficient to support the data rates of multiple concurrent file transfers. And the hot-backup function introduced in our system pro-vides high data accessibility.