From what I am aware in the past the best way to preserve Historic events and facts would have been most probably information carved into stone, monuments and if lucky word of mouth. Followed by the written word. Were there any other ways to preserve historic fact and ensure authenticity and protection from alteration from third parties?
While in the current day and age I would say the new ways to preserve current facts should be included internet repositories (online and offline), hard drives and probably blockchain project such as Historia.network and Everipedia.org.
Question is have I forgot any methodology for recording facts and which in your opinion could stand the test of time the best?