Disable Intrusive backup notifications

How do I disable notifications from the settings app which read “phone hasn’t been backed up in X many days”. They obstruct the top of the screen with a banner multiple times an evening, making it impossible to view media in landscape orientation. I DO NOT HAVE wi-fi to back up my phone with. I have unlimited LTE data, but no wi-fi. I can only back it up when I have access to wi-fi, an outlet, and the time to sit there. I don’t get a combo of the three very often, so the notification messages are a constant nuisance. I also do not wish to disable backups entirely for the situations in which I do have access to automatic backing up.