Above all, your information must be kept safe from loss. There are a thousand ways to lose your data, so you must have systems that make certain your information is there when you need it.
Do you lock your building when you leave at night? You must take steps to provide similar protection for your valuable data. If it is stolen or maliciously tampered with, you could face an expensive disaster.
Like inventory locked in a forgotten warehouse, isolated information can cost your company money in lost opportunity. Make sure all aspects of your business data can work together.