Is it possible to turn a partition's auto mounting off, so when my computer starts up it doesn't mount the drive, and if I want to mount it, I use Disk Utility or whatever? If so, how? 
Also, if it's not mounted, does that mean a program like SuperDuper won't be able to backup to it as it won't see it?
If so, is there a way to just make the drive "invisible" so it doesn't mount the icon on the desktop, but is still usable by super duper?
Also, if it's not mounted, does that mean a program like SuperDuper won't be able to backup to it as it won't see it?
If so, is there a way to just make the drive "invisible" so it doesn't mount the icon on the desktop, but is still usable by super duper?