Fixed headaches with my proxmox backup server. It has a SAS-controller and 4 spinning drives running backups at detached garage and the old fujitsu desktop I dug out of office dumpster pile just kept crashing. Flashed controller to IT-firmware, updated bios on motherboard and did everything else I could figure out but the system just lost the drives pretty much daily and required a hard reset. Turns out, or at least that's my conclusion, that the PSU on the machine just didn't have enough juice for the whole setup and that caused instability. I dug out old (2010 or so) desktop from my own pile and threw 600W PSU on the box, it's now been stable for at least a week.

I would've liked to keep the fujitsu-machine as it's in a more compact case and couple of generations newer CPU, but that thing has propietary power supply so it was easier to swap out the whole system and just move drives from one to another. So, the current setup consumes maybe a bit more electricity, but at least it's doing what it is supposed to.