iPhone 5 backup to iCloud not starting
In- order to Fix the Automatic iCloud Backup not Working issue on iPhone do the following steps ;
Step:1
Delete your iCloud profile in iPhone
Step:2
Now again reconnect the icloud profile
Step:3
Now you get message sync automatically..
Well also , check this below article to troubleshoot this issue ;
https://support.apple.com/en-in/HT203271
Hope this helps...