All businesses suffer when their IT systems fail. The catastrophic fallout can result in considerable income loss and comprehensive damage to reputation. Customer confidence is a precious commodity, and it will evaporate in light of an IT system failure.
Curing the symptoms of an IT failure is possible, but also time-consuming and expensive. A systems outage of even a few hours could result in months' worth of lost earnings. How much value do you place on your brand image? Your brand will suffer considerably in light of a system failure.