In this file I write the date and a short note anytime something important happens. Visit the doctor and get test results? Write a note. Change the oil in my car? Write a note. Get a quote for a mortgage? Write a note. Open a new bank account? Write a note. Shop for new running shoes and learn what size fits best? Write a note. Have a contractor come work on the house? Write a note.
If there are important files that relate to those I list filenames and say where they are, but frankly I haven’t found that to be very useful. Rarely do I need any original documents. And if I died prematurely, my family can just scroll through this document to check off accounts (Google will automatically send it to them if I don’t access it for a period of time).
I’ve been using it for a few years and found it to be a total lifesaver. I frequently just need to quickly see how I did something, who I used, or his much something cost.
I store the live version on Google Drive so I can edit it anywhere, but you could host it locally.