Connect your iPhone to Wi-Fi
Open Settings
Tap your name at the top
Tap iCloud
Tap iCloud Backup
Turn on iCloud Backup
Tap Back Up Now
Keep your iPhone connected to Wi-Fi until the backup finishes
To check the backup, go to Settings
Tap your name
Tap iCloud
Tap iCloud Backup
Check the date and time of the last successful backup
To back up to a computer, connect your iPhone to a Mac or PC
On a Mac with macOS Catalina or later, open Finder
On a Mac with macOS Mojave or earlier, or on a PC, open iTunes
Select your iPhone
Choose Back Up Now
To save passwords and Health data, select Encrypt local backup
Wait until the backup is complete
Keep backups updated regularly