I want to lock the UpdraftPlus settings so that other site admins cannot access them

In UpdraftPlus Premium, this is done in the “Advanced Tools” tab:

And scroll down the page a bit…

Lock settings

Don’t forget to remember your password! If you forget it, then there’s an FAQ for how to get back in., assuming that you have write access to the WordPress installation (files or database). This lock feature isn’t meant to provide unbreakable security, but to be a convenience feature to prevent mishaps and casual nosiness. If someone has an unrestricted administrator-level WordPress login, then ultimately there are ways to do anything to the site: that’s the point of an administrator login.

Locking the UpdraftPlus settings page

Posted in: Add-ons, Configuration