Thanks for reaching out. I'd like to know the exact Model number the Archer modem you're pertaining to.
If you can post a screen shot of the page that would be great and I will have it checked.
Hi, Shayne thanks for the quick response. I'm still learning the ropes on this site so hope the pics are viewable. Modem in question is a VR1600v .
Manual can be found here https://static.tp-link.com/Archer VR1600v_V1_UG.pdf
attached hopefully is a snap of the advanced system tools page showing nothing about backup/restore.
You need to log in possibly as administrator.
Go to maintain.
Then Device management.
There you can backup and upload the config file.
Handy when you replace the modem with the same model.