Manage OS X partition from Windows
Your Mac should have a recovery partition. If, for some reason, your Mac partition becomes unbootable, you can boot into recovery mode (hold down Cmd-R when you hear the startup chime) and follow the on-screen instructions to restore from your latest backup.

If, for some reason, your recovery partition is corrupted or missing altogether, you will end up in Internet Recovery mode instead, which will install a fresh copy of OS X from the internet first.