Hi, I have an external HD that I want to use as a backup drive. I do not know if I should set up a RAID 1 arrangement, so my HD is always mirrored, or should I use backup software (such as SuperDuper!) to create scheduled copies of my HD. I know that SuperDuper! creates a bootable backup, could I boot my system from the external HD if it was used as part of a RAID1. Hope that makes sense, any other recomendations would be helpful.