Draw.io [1] (now diagrams.net I guess?) lets you export a .png file with the diagram embedded in the image. So you don't need to keep the original file, and eve

Draw.io [1] (now diagrams.net I guess?) lets you export a .png file with the diagram embedded in the image. So you don't need to keep the original file, and even an old image from a wiki can be opened up and edited by anybody on the team without having to get the "diagram file" from the original author. Granted, I don't think it does collaboration so that may be a dealbreaker for you 1: https://app.diagrams.net https://app.diagrams.net