I want to do a back up
I change the screen there is no data in my phone
iPhone 12 Pro Max
You want to do a backup or restore a backup?
Back up your iPhone or iPad to your Mac using Catalina or newer OS.
ASC YouTube for how to back up your iPhone, iPad, or iPod touch to your Mac
Back up your iPhone, iPad, and iPod touch. *
Back up – What does iCloud back up. *
Restore
Backup - Restore your device from an iCloud or iTunes backup. *
ASC YouTube for how to restore an iPhone, iPad, or iPod touch from an iCloud backup