I would open it up and take a picture. But this image I found makes it look like a bog standard x86 server, so you most likely can put whatever OS you want on it
I will poke around and see what I find. If I am able to get windows or linux on it I will post a guide.
Surely I am not the only one who wants to avoid tossing these guys.
Home lab time
I will be adding pictures shortly.
The answer to my question is yes. and its easy to turn a backup appliance into anything else.
the backup 390 uses a standard msi motherboard.
Specifically a msi h110 eco-s01.
when I finish everything should I post a write up some were on here?
Would anyone else have an interest in re using backup appliances as free / low cost home lab servers?