Q: backing up

Greetings triumph,

Thanks for the question. If I understand correctly, you need some help backing up the iPhone. I would recommend that you read this article, it may be able to help the issue.

Get help backing up your device in iCloud - Apple Support

A message says my backup could not be completed

1. Make sure you're connected to the Internet with Wi-Fi.  
2. If possible, try connecting to a different Wi-Fi network.
3. See if you have enough iCloud storage for your backup, and get more storage if you need it.
4. If you need more help, contact Apple Support.

Thanks for using Apple Support Communities.
Take care