I have a moto e play mobile. The toggle to back up is on, but I notice that for backup for contacts it says waiting to back up, and back up now is greyed out. On Googling it appears there is a big problem with back ups , no reason given, and Google have offered no solution. There was a suggestion that removing security for a locked screen allows a back up, but then you would have to be continually doing this then reinstating the security. I have just manually put in contacts, following a disaster with my previous phone , plus I lost photos, so don’t want to go through this again. I bet many toggle the back up on, not realising their data isn’t being saved to Google drive.