At the moment I'm using portable hard drives. They are setup as 500GB for this years images to swap between desktop and laptop, 1TB for time machine backup and 2TB to backup 500GB external and 1TB iMac internal hard drive using carbon copy cloner. I'm thinking I could scrap the 500gb drive by only using the iMac, reuse the 2TB portable drive for 'archived RAWs' and get two 2/3TB portable drives to act as the CCC backup. I can keep one off site as I current only have final jpegs stored on my website if the worse was to happen. I was looking at what I could use for 'archived RAWs', the raid drives look like a great setup and 3-4TB would last me years. At the moment it's looking at costs of doing this, getting two right sized portable hard drives could really be all I need at present. I don't have any off site backups and they I could replace the 2TB drive later with something better and maybe raid 0 too. Anything with Thunderbolt just seems to be so expensive for what it is. Losing 5 years of RAWs and my whole LR library if we got broken into isnt worth thinking about. For a while I've thought it wouldn't be a problem but a few week ago my LR catalogue got screwed up and I had to using the backup to restore. Having nearly lost stuff I've changed my mind.