I do the same and have never had a problem with anyone asking for an original. The only real originals I keep are, birth cert, marriage lic, as well as ss card, titles, and a few other more important docs. Everything else gets scanned and shredded. I recommend this,
http://www.iosafe.com/products-solo-overview, I have a 1tb. My dad turned me on to them, they are supposedly fire, and waterproof. He has a 2tb to back up every computer in his house.