November 19, 2009 2:10 PM

I read more and I think I'm getting it. Let me see if I got this correct. The landing drive is 1.5TB but I should not use it just to make it easier to restore in case it fails. Now if I add three 2TB HDs in the internal bays that would be 6TB of space. Now I set it to duplicate but this is where I'm confused. How does it duplicate my data if all three HDs are full with my files? If one dies do I lose the data only on that drive or all? If not will I just be able to plug in a new drive and it will rebuild itself and put the data back for me?

Also does the backup drive need to be the same size as all my data? Meaning I have 6TB of data in the pool, now I need a 6TB expansion bay to backup that data?