Yes, that's a core purpose of git.

git reset --hard

Yeah, as the other commenter mentioned, git is a distributed source control system, so all clones have the full history (though you can bump up the "starting point" to reduce the overhead of storing all previous commits).

Hosts like github can add more features on top of that, which would have to be backed up separately, but you can automate the repository itself using a single command, which is the same command used to make a clone in the first place.

Unless you did a shallow clone or something every repo clone is complete in git.