That's probably the worst possible way of versioning your home besides, possibly, making a zip of your whole home directory every time you would otherwise to a commit.

Just use a snapshot-enabled filesystem. ZFS works awesomely, BTRFS too (but it's not released as stable and production ready AFAIK) and LVM can have snapshots too (take a look at the snapper project by Red Hat).

Just use ZFS and snapshot the whole filesystem.