I have a 1.96 TB git repo: https://github.com/unqueued/repo.macintoshgarden.org-fileset (It is a mirror of a Macintosh abandoneware site)

  git annex info .

Of course, it uses pointer files for the binary blobs that are not going to change much anyway.

And the datalad project has neuro imaging repos that are tens of TB in size.

Consider whether you actually need to track differences in all of your files. Honestly git-annex is one of the most powerful tools I have ever used. You can use git for tracking changes in text, but use a different system for tracking binaries.

I love how satisfying it is to be able to store the index for hundreds of gigs of files on a floppy disk if I wanted.