Hi Guys, I'm in the process of changing a lot of my current setup because I need more storage space for my photographs, which means that the 1TB drive in the old iMac is going to be replaced. Oddly, it's being replaced by a Retina MacBook Pro with a 512GB SSD so the majority of my photo library will need to be stored externally, with the MBP holding just my active projects. Now, at the moment I have my photo collection on the internal 1TB drive, which is then cloned to an external USB 2.0 drive, and then backed up to Amazon Glacier as well. It's simple enough for me to transfer my photo library to an external drive in the new setup but I want it to be backed up so I think I need a RAID 1 solution. The available capacity of the solution should be around 2 or 3TB. I don't (yet) make money from my photography so I don't currently need a professional level solution but I do want RAID 1 for some degree of piece of mind before the data gets to Amazon. Connection via USB 3.0 is likely all I need but the MBP will have Thunderbolt if there are some affordable solutions. Having just blown a load of cash on the MBP and a separate display I'd like to keep the costs down at this moment. Any suggestions?