The main saves should be in saves, not savesarchive or savebackup, I use the Itch app too and mine are there. If you are on a sub user account on the computer you might need to look in the main user's directory? Honestly I'm not sure why they wouldn't be there.
Ah, there is a separate folder in the user directory specifically for itch. I'm not really sure why though, since the install location still seems to be the regular user directory. Either way, thank you!