DAS 4 to 6 bay recommendation?

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I would recommend Thunderbolt/USB C 3.1 gen 2 boxes from Pegasus, Buffalo, Areca. These brands offer hardware RAID that speeds up the data transfer speeds and also is more reliable.Here are a few models listed:https://nascompares.com/answer/expandable-hardware-raid-based-thunderbolt-3-hard-drive/https://nascompares.com/2018/12/03/buffalo-thunderbolt-3-6-bay-hardware-raid-review/I hope this helps.