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 used this feature for the longest time back when Photos storage didn’t count towards your free 15 GB if you used the compressed option. And then they went and made it so everything counted towards your 15 GB, no matter what quality you were backing up at, and suddenly my account was using too much storage space to keep receiving email. I go into Google Photos to clear out some of the largest pictures and videos to get a few gigabytes back, and it tells me that if I do that it’s going to also delete those photos stored locally on my phone. So now Google Photos is uninstalled because if I ever let it back on my phone it’s going to delete all my pictures.
Yeah, I had a photo album back when I regularly used Photos, and for some reason the photos would be backed up and the older ones would stop loading on my device? Which was a problem as I don’t have any cellular data. It still happens for some reason, even though I no longer have backup enabled.