It's a mix of crap I've acquired over the years, all 1TB drives, 3.5",most 5-10 years old, in an old Drobo I inherited. Yea, it's a massive risk, but it's one of 3 storage systems replicating data locally, plus a Crashplan backup.
Since it's 5 drives, I'm pretty sure it spins them down - at best if they drew 3w each, it'd be 15w in drives alone.
Running it on a smart switch, I've never seen it draw more than 30w, and that's at boot time with 5 drives.
My 3-drive Proxmox box (a Dell SFF) drives are a mix of spinning metal and SSD (2.5"), it idles about 20w, peaks at 100w when I'm converting video files with a VM. That hardware is about 5 years old too, 32gb of ram, booting from an M2 drive.
My use-case is very high idle time (95%+?), so I'm targeting lowest idle power consumption. Pretty much anything will suck power once I'm doing anything heavy (like video conversion).