Question

For example: I remove a large image from the project and commit. I know the image is still saved in there in the history. Later, I’m asked to add the exact same file back into the repo. Does git know it already has that file in the history and use the same data or does it save the large image into the history again?

Answer 1

The blob hash should be the same at least but im not sure if and how git might use some kind of delta compression. A tip is to inspect your repository with git ls-tree.

git ls-tree HEAD path/to/image
git ls-tree <older-commit-with-image> path/to/image