Archiving Whole Docs, Pages, Folders

I beseech the community to help me with my thinking…and what might be a basic ask.

I’m a freelance consultant and have created docs for each client, and then place them in a corresponding folder - so that I can collaborate with the client and partners.

Once the engagement is complete, I’d like to move all docs and pages to some sort of archive feature. My content isn’t typically data rich…I just need to get it out of my line of sight.

I thought I saw help references to an archive function but for the life of me I can’t find it.

Any thoughts are appreciated.