For anyone interested in these features today, check out Git Annex. Fits all these requirements except for tagging. Add files just like with git, then git annex

For anyone interested in these features today, check out Git Annex. Fits all these requirements except for tagging. Add files just like with git, then git annex copy file --to some-remote. Intended for large files, you can Zip directories too if you like. I personally like directory organization but that's optional.