I don't have the original manual for my machine. I'll probably order one from ebay so it's "complete". But I'll store it in an archival sleeve just for keepsake. I'm not sure if they take any steps to preserve books and things, but I know they wear gloves any time they touch the pages to prevent the acids from their fingers from getting on the pages and are very careful with turning pages.
I've got a download of the manual and adjuster's manual printed out and bound for use.