Like all things, business continuity plans are not perfect. They have pitfalls that can result in your business’s failure if not taken into account immediately. Don’t blame it all on the IT guy; often, the way a system is designed can also have loopholes.
Your service provider, who you have tasked with looking after your company’s IT, has kept your business up and running for the past 10 years. Usually, that kind of longevity in developing continuity plans has resulted to some providers overlooking or underestimating certain issues.