Your Security Perimeter
Your real security is not digital. It's the people who access your assets.
You already know who has the keys to your business. Writing it down is what makes the perimeter real.
You can list, off the top of your head, the small group of people who can access the things that matter. Your editor, your manager, the agency that runs your social, the bookkeeper, the assistant who handles your calendar. Maybe ten people. Maybe fewer.
That list is your real security perimeter. Not the office, not the laptop, not the password manager. The perimeter is the people who have legitimate reason to access your assets. Most security failures happen at this layer because nobody documented it.
Here is the strength you already have. You can probably name everyone on that list right now. You know which agency has admin on your social accounts. You know which accountant has read-only on the bank login. You know which freelancer was given access to the cloud drive for a project that ended six months ago.
What you do not have is the document. The list lives in your head, which means when you make a decision (move bookkeepers, fire a contractor, switch agencies) you are running the offboarding from memory. Memory is not a security tool.
The construction work here is small. You are not building anything new. You are taking the awareness you already carry and putting it in a place where it can be acted on by someone other than you.
Open a single document called Access Inventory. Date it. Make it the canonical record.
List every person and service with access to anything sensitive. Bank accounts, social platforms, cloud storage, email, payment processors, content management, analytics. Note what level of access they have.
For each entry, note the trigger that should remove that access. Project end, contract end, role change, scheduled review. The trigger turns a static list into a living one.
Set a recurring 90-day review on your calendar to walk the list. Most of the work will be confirming nothing has changed. The minutes you spend on the review prevent the months you would spend on a breach.
Share the document with one trusted person who can act on it if you can't. The point of the inventory is that someone other than you can use it.
You have been running this map in your head for years. The work is moving it out of your head, where it disappears the day you get sick, and onto a page where it survives any moment your business needs it most.