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With modern 4TB drives, a 4-bay unit would let you build a 4-drive RAID-5 with 12TB of fault-tolerant storage (i.e. if one drive fails, you don't lose anything ... you just replace the drive and let the system rebuild it). Or you could build an 8TB RAID-6, where you wouldn't lose anything even if 2 drives failed !! (RAID-6 protects you against the situation where a 2nd drive fails while you're rebuilding a drive)
Of course the 8-bay unit you linked to would allow even larger arrays ... up to 28TB in RAID-5 or 24TB in RAID-6.