Connect your iPhone to Wi-Fi
Plug your iPhone into power
Open Settings
Tap your name
Tap iCloud
Tap iCloud Backup
Turn on iCloud Backup if it is off
Tap Back Up Now
Stay connected until the backup finishes
Check the date and time of the last successful backup
Connect your iPhone to a Mac or PC with a cable
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 all of the data on your iPhone to this Mac or This computer
Select Encrypt local backup if you want to save passwords and Health data
Click Back Up Now
Wait until the backup is complete
Confirm the latest backup time in Finder or iTunes