Is your backup culture really that sketchy? Your source code is probably just one of several digital assets the loss of which would cripple your company. If you don't consider an SVN repository reliable, it might be a good time to check your database backup procedures.

Also, SVN stores a local copy of the codebase as well. If you're working off trunk and the SVN server detonates, all you lose is the history and any branches you didn't have checked out.

You get the same thing with any developer using git-svn...

You can just train the "new tech tolerant ones" in git-svn and don't worry as well.