In the 2020's, this refers to writing down everything you know, usually in some graph structured way.
This is also the closest one can get to immortality pre full blown transhumanism.
Ciro's still looking for the restore this plaintext backup on a new body though.
It is a good question, how much of your knowledge you would be able to give to others with text and images. It is likely almost all of it, except for coordination/signal processing tasks.