It appears every few times I open the app and the usual android back button doesn’t make it go away, and there is no cancel button. What you have to do is toggle the toggle, then the button will change to “do not back up” and then you can press it. It annoys me how easy this makes it to accidentally turn on backup.
I’ve always liked Open Camera. Of course YMMV depending on your device.
edit: it’s also on F-Droid if that’s your preferred store.
I use Open Camera on my device, there are some very rare instances where it shows an obscure error saying it can’t find a gallery app. Most of the time though it opens Fossify Gallery just fine
I’m rooted and Google Photos was removed from my device before a single photo was taken, so never seen or heard even a peep from it