You're right that you can't get a diff of a large binary (or even a small one). It's still useful to know when the file changed and who changed it. For exampl

You're right that you can't get a diff of a large binary (or even a small one). It's still useful to know when the file changed and who changed it. For example, imaging you work at a video production company where you have videos on each page of your website. (Let's also imagine that you're not using vimeo or youtube to host them.) You might make a branch of the home page with a different video, and you want to coordinate changes across pages. git-annex is amazing for this use case, as you don't have to actually have a local copy of videos that you're no longer using.