Why is it important that all locations where a piece of information might exist be secured?

What will be an ideal response?

If the same piece of information can exist on a number of local paper records and also be present in several central databases. The problem for security is that every one of those places has to be identified and secured in order to ensure that particular generic item of information is kept safe. Otherwise, a compromise of an instance of the item in one location will compromise all other instances of the same item in all other places.