OK, I'll answer my own question: assuming you have multiple drives, you subtract the biggest one and add the others so that if you have 1 1TB drive, a 750, a 500 and a 250, the non redundant space that you have is 1.5 TBs. Not bad. But I've been reading some really bad reviews about data loss and formatting speeds that are quite disturbing. If one compensates for the fact that people like to whine and rant more than they like to study, much of the negative reviews are hogwash. But there are too many that remain like the one about data loss due to firmware updates. One reader retorted that, of course, if you do a firmware update, you back up your data. Huh?
Would someone who REALLY knows what they're talking about reply please? I'm close to just buying a La Cie Big Quadra.
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