NAS Appliance
For hardware we use compact NAS servers. The choice of the moment is QNAP TS-509.

This small box offers sufficient capabilities: Intel Celeron 1.6GHz CPU, 1GB DDRII memory, 5 x hot-swappable SATA bays, various RAID levels, 2 x Gigabit ethernet ports. It runs embedded linux.
Here is some basic info about the system, which you see if login via SSH:

