What this guide is, and is not
This is an operational guide for small businesses, not legal advice. Data protection obligations differ by country, by industry, and by the location of the people whose data you hold, and they change. Confirm your own obligations with your regulator or a qualified adviser. What follows is the practical structure that makes meeting those obligations possible: knowing what you hold, controlling who can reach it, deciding how long to keep it, and being able to answer a question about one person quickly.
It is worth being clear about the actual risk profile of a small business. The scenarios that dominate security marketing are rarely the ones that cause harm. The realistic risks are a reused password, a departing employee, access that was never narrowed, and an inability to find everything about one customer when asked. All four are addressed by habits rather than by budget.
