To be fair to the subversion guys, its pretty darn easy to setup real-time backups. Use svnsync and hook it up in some post-commit hook.

Having said that, to have git completely backed up, it's not as simple as a clone. You will need to mirror another repository so that you can get all of the branches, tags, etc. Additionally you will need some sort of post-receive hook so that your mirror is kept up-to-date.

Now, my conclusion with backups for svn and git - both need some intervention. Its not as simple as "press this button and it just works".