I'm going to agree with the scan snap people. I have been using it for almost seven years and it is still going strong.
We just have everything save to our computer (backed up to the cloud). The files are so small that it really isn't a problem. Each year I go into the scanned folder and delete anything over 5 years old. I figure that we have our shop management system that keeps all digital copies of the ROs forever, and if we would have needed anything from the scanned copy, it would have been within those 5 years.
The most important thing we figured out with the scanning took us a while to realize. Scanning does take up a LOT of time if you are doing it all at once. It used to be a real drain on our time. But then we started scanning as soon as we checked the customer out. We check them out, scan the RO with any associated parts invoices, label them with the customer name and RO #, then stick the hard copy in the shred pile. It takes no time whatsoever and we are always caught up!
Every now and then we get a rush on customers and the ROs pile up for a few minutes, but scanning 5-10 ROs takes no more than 5 minutes at the most.