Android Pie has a native manual back up to google drive. After I turned off the back up and turned it back on, the back up button is grayed out.
Since then I
- Re-added my google account on my phone
- Cleared Google Drive cache
as described here, but to no effect.
Another person solved the issue through the ADB debugger. I ask here because I would like to avoid installing ADB. Do you have any ideas?