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You're right, just had a look and it averages 25W at idle (6 spinning drives plus SSD with AMD 5600G). Last week, despite some spikes of 100W when there was a lot of transcoding going on, it averaged 32W.
It's really only the first two of those that I have that I care about and they are on cloud (two clouds in the case of photos) and local (plus a reasonable amount of stuff on either paper or email).
Losing other media would be a bit annoying but there's probably nothing there that can't be replaced but obviously that's a pretty personal point of view.
aggi-
6 spinning drives plus SSD with AMD 5600G
This is the problem with self-building a NAS.
One of the biggest costs from an always-on machine is the power, and a CPU with a TDP of 45-65W (in modern CPUs this is the average power consumption under load) and 6 spinning drives... is considerable.
Hence the desire for a CPU with 12-25W TDP, and that can fully hibernate the HDD when they're not used, and can spin fans at a power rating so low that when I tried putting Noctua fans in they didn't work and my power meter showed that Synology are only putting 2v to them in Quiet mode (too low to start a Noctua fan). Reddit people measuring the DS1821+ get it to 20w idle and about 80w fully loaded with 8 x 12TB HDD... larger drives use a fraction more power (they spin faster more of the time), so I'm expected a range from 20-85w for "night time" vs "fully loaded operation".
I could easily self build... but the power usage would never be where I wanted it, I'd have to maintain it, the perf wouldn't be the same (that SSD cache is nice), the physical space requirement is larger (case not as compact), I couldn't afford ECC memory within similar price point, etc.
The big reason to self-build though, ZFS... Synology does not do ZFS. But the RAID5/SHR+ BTRFS combination yields the same benefits and is what their Enterprise class products all do, so I'm OK going down this path.
Velocio
I'm not sure I believe this number... but single machines are so hard to measure. The Synology will be 26W idle, and 59W fully active. The SSD cache allows the HDD to hibernate for longer, meaning it will be idle the majority of the time.
And it depends what you have on the storage as to how important it is and how paranoid one is likely to be... for me:
The first few of those are such that yeah, I'm doing full 3-2-1 backup strategy, at least 3 copies (local, NAS, and backup), on 2 medias (SSD local + HDD NAS and backup), and 1 off-site / disconnected (the backup).
I'm even more paranoid in fact, the document class above is also syncthing on a few encrypted laptops so my primary copy is always a working copy rather than the NAS.
But the NAS is the golden copy, the long-lived copy.