You are in Power Saving mode.iPhone 6s hasn't backed up since 9/22. Now when I go into iCloud settings backup is greyed out and I can not turn it on. Any ideas? Restrictions are off.
All other icloud stuff like photo library and so on seem to be working perfectly.....
May have to log out of iCloud reboot then log back in.
You are in Power Saving mode.
Not having too much info about it, i can only google and guess
http://www.easeus.com/iphone-recovery/fix-icloud-backup-greyed-out.html
Yellow battery indicator means it is in Low Power Saving mode. Go to Settings: Battery: Low Power ModeDon't believe so but I'll toggle it and see if that helps.