Documents created for every transaction , be it purchase or sale or stock movement, have to be kept by the companies / firms for many years, for audit and assessment purposes. That is where document scanning services come in to play.
Today you have a handful of document scanning service providers who can help you in keeping soft copy of all your important documents at very low cost. The best part is that these soft copies can be carried easily and sent across to various places through the internet itself at a cost of few dollars.