At this point I wish I just got a MacPro instead, this wouldn't be a question.. I have a new 17"uMBP, bought specifically to take advantage of eSATA through the expresscard slot. I do photography and video work. I bought the best possible card, the Sonnet Tempo dual eSATA, to offer highest transfer speed and because it's the newest technology. To accommodate my media I bought a OWC Mercury Elite Al-Pro 2TB RAID 0. It's great. I wish I got the Qx2 RAID 5 but it's a little pricey and expensive to upgrade, but at least it has redundancy. I need to have a reliable backup solution. Drobo is expandable but I've seen so many poor reviews. I could buy another Al-Pro 2TB RAID 0 and connect them both and do a software RAID 1 with them. Or I could buy a cheap 2TB eSATA external and do daily backups. I could also get a dock and fill up drives as needed... Is there really an advantage to mirroring other than if my drive fails in the middle of a job? Wouldn't the software RAID needlessly slow down my system? Even if I did get the Qx2 RAID 5 it is bad to rely on such a system by itself to both store and backup my media or is it in itself a very reliable solution?