On that same subject, here's a quick video that emphasizes some of these points.
Many business owners may be reluctant to walk away from their business, afraid that, because they're not around, things won't get done right.
THAT'S where the beauty of an operations manual comes in.
In the simplest sense, think of an IT operations manual as your way of telling your employees how to do things the RIGHT way.
Once you have your business operations codified, it makes it easier for others to follow. That way, they also can't say, "I didn't know that was the way things were done", because you'll be able to show them in writing.
Creating a manual of written procedures and having it on hand is also a great way for employees to learn about your business culture. You could even drop in a short history of your business that could help explain why you do things a certain way.
All this leads to a better understanding of your business by your employees and a much more efficient operation.