Welcome to the Apple Support Communities. I see from your post that you're having trouble backing your iPhone up to iCloud. I know how important it is to back up your devices regularly, and I'm happy to help.
Are you getting an error message when you try to do a backup? The following article has several ideas for troubleshooting iCloud backup issues:
If iCloud Backup couldn’t be completed or you can’t restore
Let us know what happens.
Have a fantastic day!