[Aga]

For me Git has also worked very well for small projects. I actually learned it initially by using it for my masters thesis.

One correction: Git does not store changes at all. It stores all the versions of files as separate "blobs". What keeps .git small, is that Git compresses the object database to pack-files. "git gc" does this for you.

Pro Git has a great chapter about how Gits internals work: https://git-scm.herokuapp.com/book/en/v2/Git-Internals-Plumb...

This picture sums the model nicely: https://git-scm.herokuapp.com/book/en/v2/book/10-git-interna...

For me studying Git internals has been a good lesson in software design. Git's core is very simple, yet somehow that makes it a really versatile tool.