Well, first of all, just like any sane person have backups (your files, your plans etc) - any sane person or business have (or at least should have) a backup c

Well, first of all, just like any sane person have backups (your files, your plans etc) - any sane person or business have (or at least should have) a backup configuration in case prefered DNS goes down. So this is not a problem really.