Another thought - there are many services for storing any private information on remote servers in large data centers and it`s safely and cheap. So if your clients are thinking about storing their information, I think they know about these services.
What is your value for your clients? Just scanning documents?
Another thing you would consider is learning small businesses how to use their computers for business. Actually it`s our headache, because our clients are the same small businesses and we received letters and calls "We are not very good with computers, please learn us how to change regional settings in Windows, how to install, how to use e-mail clients" and so on.
Also a lot of people buy new computers with Windows Vista, and it`s hard to have softwares they used earlier working on Vista and even install on Vista. May be it could be your service, installing and making sure all programs are working.
A small business management software for the field service industry.
U.S. Microsoft Gold Certified Partner
Small Business Specialist