If I wanted to indefinitely back up every image my wife's and my phones take, without me having to think about anything other than an annual bill, what services

If I wanted to indefinitely back up every image my wife's and my phones take, without me having to think about anything other than an annual bill, what services would people suggest? Currently Google does this perfectly for us... except for the part that maybe it's not actually doing that after all, and the fact that it's Google and they're seemingly less competent by the hour. Apple is the only alternative I'm aware of. Edit: Just to be very very very very clear. I don't want to have to do ANYTHING but pay a bill.