Hi, My primary data disk (that holds my photos and lightroom catalogue) failed yesterday. The partition table was lost, the drive showed up as RAW, but I was able to recover all the files. I have online backup through Crashplan, so I was never that worried, but it got me thinking what to do when replacing the faulty drive. The drive is a data drive, and as mentiond, online backup is performed. Would I be better of with a single HDD, or should I invest in two, so that I can set-up a RAID 1 (mirroring) and have fault tolerance? Or, to put it differently, will a RAID 1 be overkill, considering that I have online backup as well, and have a NAS where I can also do local back-ups to? If I go for a RAID set-up, I will get a couple of Western Digital Red HDDs. For the single drive set-up I am considering a large (3 or 4 Tb) WD Green instead. How well does the WD Green work with Lightroom?