My WiFi is permanently turned off on my iPhone and my Mac won’t allow me to backup my phone
My WiFi on my iPhone is permanently turned off and it won’t allow me to back up my phone
MacBook Pro 13″, OS X 10.11
Back it up using iTunes (or Finder) on your computer connected to internet, disabling wifi.
I've always backed up my iPhone to my computer using airplane mode (therefore without any wifi connection).
Regards
Giulio