How do I back up

Hey Tebogo257, to backup your phone please follow the instructions in this article: https://support.apple.com/guide/iphone/back-up-iphone-iph3ecf67d29/ios. If you are unable to then you may be out of iCloud storage, to increase your storage in the clould please follow the instructions in this article: https://support.apple.com/en-us/HT201318. It is reccomended that you back your phone up so in case it breaks, you wont loose your data.

Hope this helps, have a great day!

-Kyle