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 installed "aves" from Droid-ify. That's the one that I described.
When searching for aves through F-droid Basic, I got only the Aves Libre as a result. Installing that and opening it doesn't result in any Android version warning. 👍