I have a late 2013 iMac 5k. I do a lot of photography, processing with Photoshop and Lightroom. However, I also do a lot of audio recording (mostly podcasting), so I require a near silent work environment. When I first bought the iMac, I also got a LaCie Little Big Disk. It's a super fast 1 TB set of set of PCIe SSDs preconfigured in RAID 0, and it's completely silent. Admittedly, it is total overkill for photography work, but I've been really happy with it... until it filled up. I've been using a separate 4 TB HDD in an external enclosure from OWC for backing up both my iMac's internal drive, as well as the LaCie drive with my photos. Now I need more capacity, and I'd also like to combine storage and backup in the same enclosure. Naturally I'm considering a Thunderbay 4 from OWC. But I'm stuck on which one to get. A Thunderbay 4 with 3.5 HDDs in JBOD probably makes the most sense. I could have 3x 4 TB HDD, one for photo storage, one for backup of photo drive, one for Time Machine. And then a 1 TB HDD to back up my iMac drive (512 GB SSD). Problem is, I fear this will be too noisy. Even if I get a quieter fan, I'm worried about the noise that the spinning drives make. Second option is a Thunderbay 4 with 2.5 1 TB SSDs in RAID5. This would give me 3 TB of storage space with some protection from failure. With a Noctura fan, it would be near silent. But it is not a true backup, and I would still need a separate backup drive, which is not the most elegant solution. FWIW, I do have offsite backup with Backblaze. But although that does offer data protection, if the whole Thunderbay unit somehow got fried, it might be nice to have a backup closer to hand than Backblaze. I believe they will ship a drive with the stored data, but not sure about that. Any ideas would be appreciated!