What to do with "There was a problem enabling iCloud Backup" on iPad?
The iCloud System Status page lists several problems on 13 October.
Others have said they had the same problem, so maybe one of the troubleshooting pages linked from the iCloud Backup Support page might help?
Later: Yes, it does help. this linked page 'iCloud: troubleshooting creating backups' lists specific error messages and says of yours:

&quot;There was a problem enabling iCloud Backup.&quot;
There are various reasons that this can occur. If you receive this alert, wait and try again later. If you receive a more specific alert message as well, make any required adjustments and try again. If you continue to receive this generic alert, contact iCloud Support for assistance.