If it can be installed on arch, it can be installed on steam OS. You just have to jailbreak it beforehand, as I said in the previous comment.

Can’t be worse than trying to fix dependencies for maven on any platform

I installed some games from GOG on the steam deck. The hardest part was trying to figure out how to make them show up in steam library. For software that requires modifying the system, you’ll have to jailbreak the steam os. It’s quite straight forward and irc it took me about 30min to enable sudo and install ydotool for autoclicker.

New drives are more like 20€ per TB. Factor in redundancy with something like raid 5 and boom, off-site storage costs you a government toppling 20 000€ in hard drives.