Back up as soon as possible everything you care about from there, starting with the small stuff. Then next time when you have "some important data" have multiple copies of it and check them periodically.
Data Hoarder
We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
Yeah that's kinda basic data preservation practice.
The ssds are just windows and installed programs. No point to making a backup, but I do have a system image backed up to hdd anyway.
I more just want to make sure they're in the best shape possible after booting up, and wondered if anyone had any guidance on that.
Probably full read (like a badblocks in Linux or HD Tune Pro in Windows) should check everything on the physical level (note that all storage nowadays has checksums and even recovery data itself, this is why mostly everyone can ignore all the checksumming file systems without mostly everything falling apart).
Not much you can do after it's been storage. Boot it up. It will work or it wont.
Should be fine imho. Going a year without power shouldn’t be an issue or else tons of people would have issues worldwide