I have a 2011 Mac Mini with USB2 and Thunderbolt but without USB3. This is used as an Itunes server (mp3 and movie files) and sits in a large but non-ventilated closet. It currently has a 256GB SSD used for the OS only and a 500GB HD that houses the iTunes media. I have 3 3.5" 2TB drives that I use to backup photos, videos and music (flac cd backups). I also have USB2 external drives that I have cloned backups of these drives. Currently, I keep everything in the original packaging and bring out a "toaster" style dock to use the 3.5" drives. They are only used maybe every 3 months or so when I want to find something. I've been thinking of putting the 3.5" drives into an OWC Thunderbay 4 and just leaving it on so I can more easily access these drives. Are there other options that I should consider? The one Thunderbolt RocketStor 5212 doesn't seem to be very reliable. The other Thunderbolt enclosures seem to be more expensive. I do have an Elgato thunderbolt dock with USB3, but it gets pretty hot and I don't know how reliable a USB3 enclosure would be if it were run through this.