To keep your files in your office is unproductive and expensive for several reasons:
The high cost of space in the center of the city.
Doing physical searches on your documents, when you want, does not justify keeping an area designated exclusively to that.
The cost of not taking advantage of your filing areas which could be used for other functions, this provides a greater value to your business.
Waste of workers' time in searching for a specific document.
If you have many sites, each one with a place dedicated to files, you do not have centralized your files.