Yes, I print out 2 copies of my invoices, one for me and one for the customer. But the hard copy I keep really isn't used for much. I use Quickbooks and backup my company file every time I make a significant amount of entries. In this day and age there's no excuse for losing your financial information. There are USB hard drives, thumb drives, online backup services (some free), CDs. Get an integrated system and use it and backup your data. Quickbooks doesn't require much of a computer to run...you could get a used/remanufatured one for $150 to $200 that would work just fine. And you can very easily and quickly manage and analyze your company financials with it too and spend the time you'd use figuring it all out with pencil and paper to go out and make money. If you can post a message here with your computer, there's a really good chance you could run Quickbooks with it. This is 2012......not 1985...get with the program!