It makes most sense when you're chasing terabytes per pound and the NAS sits somewhere noise doesn't matter. Think garage, or a rack in the cupboard under the stairs. You also get five years' warranty, two more than the cheapest NAS lines. CMR, thankfully. SMR and parity rebuilds don't get on.
!Watch out for
It's a 7,200 rpm drive and you'll hear it working.
No Backblaze failure rate for this one. They don't run enough of them, if any, for a figure worth quoting. On paper it makes 20 dB at idle and 36 dB seeking. WD lists 5.6 W at idle and 6.5 W working, which comes to 49 kWh a year for a drive that idles around the clock. Four of them in SHR or RAID 5 give 42 TB usable, or 38.2 TB once Windows has done its binary maths on it.
Specifications
Each value links to the Western Digital page or datasheet it came from.