git-sizer
Compute various size metrics for a Git repository
...Big repositories take a long time to clone and repack, and take a lot of disk space. Avoid storing generated files (e.g., compiler output, JAR files) in Git. It would be better to regenerate them when necessary, or store them in a package registry or even a fileserver. Avoid storing large media assets in Git. You might want to look into Git-LFS or git-annex, which allow you to version your media assets in Git while actually storing them outside of your repository. Avoid storing file archives (e.g., ZIP files, tarballs) in Git, especially if compressed. Different versions of such files don't delta well against each other, so Git can't store them efficiently.