Note that git really wants to use memory mapped files when committing/restoring files. This means git has problems with large files, at least on 32-bit systems. For example, I could not store video files with a size of 200MB or so in a git repository.
Also, git cannot purge older backups or create "holes" in the history. You cannot age out old or intermediate backups. git wants to keep the full history.
Other than that, git has at least the user interface part of storing and restoring things done.