Mine is real simple. Text document to make notes of where I acquired the tree, how much, what year, who collected it, who sold it. Then, I make note of when I repotted/styled the tree, any pests I might have encountered during the year etc. Each year, each tree gets a few lines in their document. Then, I just throw a bunch of photos and design virtuals/sketches in the folder with the text document. I do rely on my memory a bit too much sometimes, but Im young, so hopefully I have 50 more years before I need to worry about memory loss : ) Maybe 70 years if im lucky.