How To Backup Your Device ... To iCloud
Step 1:
In the SETTINGS app, tap on your name at the top, then tap ICLOUD. This will open the screen that displays all of your backup information, as seen here.


Ensure that all of the items that you want backed up are selected, then scroll down to "iCloud Backup" and tap on it.

Step 2:

Turn on iCloud Backup, then tap on "Back Up Now".