Thank you, @gazumped.
I have a Plus Plan. I tried to access Note History, but it seems that it's only available with Personal o Professional Plans. I'm creating backup notes manually, but information is missing even in some backups.
I don't think so. This note has 16 KB, 639 words and 3299 characters. It's 8-10 lists with 50-60 links to other Evernote notes. But I've done this kind of note before and this is the first time I find troubles.