I am needing to relocate my user data from my internal 1TB HDD to an external HDD for both space reasons and to separate data from boot. My data is home use with a standard mix of documents, photos, music and movies, with movies making up a bulk of the capacity. I want to make sure this drive is backed up/duplicated somehow. Currently, I have a clone of my internal HDD minus movies on a 500GB external HDD, and I have my documents and photos backing up to another external 1TB HDD via Time Machine. I am also backing docs, photos, music and movies to an online service The new user volume will end up being a little over 1.2 TB. If I was too purchase 2 2TB HDD for this new volume, should I set it up as a software RAID 1 or just clone one to the other nightly? I am not concerned with versioning as the bulk of this data is music and movies that never change, and the rest is versioned elsewhere. Any suggestions or personal experiences appreciated.