You think you are protected: RAID to guard against hard drive failure; dual network cards with separate Ethernet switches, and redundant power with a couple of UPS (Uninterruptible Power Supply) systems in case of a power failure. But what about your telecomm closet?

Doh! Here is the scene we have seen repeated countless times: Internet router, firewall, and even your Ethernet switches are just plugged into the wall outlet! Your vital link to clients and the outside world rests on an unconditioned wall plug and an electrical grid in dire need of upgrade.

Make sure all your network electronics are protected by a UPS. This alone will save you from losing components due to power fluctuations and outages. You may need two for heavier loads. UPS's fail too, so an online spare won't hurt. With respect to potential of losing hours of productive/billable time, UPS systems in your telco closet are insanely cheap.