CPU: Dual Xeon X5670 @ 3.33GHZ
RAM: 160GB ECC DDR3
HDD: 12TB RAID 50 Array
With hot backups to two separate machines and a separate cloud backup with 30 days of retention for hot backups and 90 days of retention for cold backups.
We are hosted on a dedicated modem (unfortunately provided by our ISP, but it was the only way to guarantee support from them with our gigabit connection). Login server is constantly updated via dynamic DNS as dedicated IPs aren't available through our ISP at this time for our level of service. All internal switching and routing is handled by a combination of Ubiquiti network gear (EdgeRouter4, ERX).
Additionally, all of our infrastructure is on a UPS that is keyed to save and safely shutdown the server in the event of a power outage in our area.