I apologize if this has been discussed before but I could not find the answer. When you boot up from an OSX install disk, you will have an option of "reinstall OSX" or "Restore from Time Machine Backup". So what is the difference of restoring from Time Machine on that menu from a clean install and a manual time machine restore. I have always done a clean install followed by a time machine restore. I was wondering if I can do that in one step as mentioned above.