I bought a 27" iMac retina and need to look at external hard drive enclosures for multiple drives. I currently have two 2 TB hard drives and I'm looking at several 'scenarios'. Mostly storage for music, documents, and lots of images as well as some video files. Help me think through these options. Scenario 1: Get a 4 or 5 bay enclosure and add my 2 drives and add more in the future. Possible options: Drobo 4-Bay http://www.bhphotovideo.com/c/produ...21_4_bay_3_gen_3_5_sata_ssd.html/prm/alsVwDtl Xcellon DRD-401 Four-Bay http://www.bhphotovideo.com/c/produ...drd_401_4_bay_external_raid.html/prm/alsVwDtl Oyen Digital Mobius 5-Bay http://www.bhphotovideo.com/c/produ...mobius_5_bay_raid_enclosure.html/prm/alsVwDtl Scenario 2: I have a sata docking station that I bought to retrieve data from my sister's hard drives after her PC died. For $30 it was a nice investment. I could just keep my drives as is in a drive case and swap them back and forth as needed. This would be slightly inconvenient as I'd need at least one connected most of the time. Scenario 3: Get a 8 TB Thunderbolt or USB 3 WD MyBook. Obviously USB 3 is the cheaper option. Speed is nice but not a necessity for my needs. Could entertain RAID with this. I could even entertain scenarios 1 & 2 above but instead get a 2 bay enclosure instead of 4 or 5.