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Synology DS925+ or a DIY four-bay, five years, drives excluded: $1,116 against $768 to $792. Everyone assumes the DIY box wins on electricity. It wins by $323 to $347, and electricity is $32 to $56 of that. The premium is the enclosure price plus DSM being included.

techfuelhq.comSynology or Build? The Five-Year NAS CostFive years of a Synology DS925+ against a DIY four-bay build, priced line by line on published idle-power measurements. Electricity is not what decides it.

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A caveat I left out: the 28W Synology and 21 to 24W DIY idle figures come from two separate NAS Compares reviews. The DIY reading had four 4TB drives idle under Unraid; the Synology figure is DSM with base apps. So the $32 to $56 is an estimate, not a like-for-like bill.