Archive pages I no longer use

I built a web site in Grav that collects different artworks for each year. Now we have 2000 artworks (each artwork is a page with many media files).
In the new year I have to reset previous artworks and charge newest ones.
I'd like to move artwork folders to another location to allow admin user to consult and search them
(only in the admin area, not in frontend site). But the admin plugin is rather slow because always shows all pages.
What do you recommend I do? To me it would be to create a user/pages2 folder to store this pages and in admin plugin
to have a menu Pages 2 in addition to Pages
I'll wait your suggestions 🙂