Protection of Customer Data For Home Business

I have family members starting a small home business and requesting advice on how to setup their home business computer. They will use their Windows XP laptop computer to record and process orders using the Internet. The request is to protect the customer data from physically or electronic miss use. Second, only authorized users will access customer data and restore any lost data. This report will respond to family members request or anyone else starting a small home business needing customer data protected.