Connect your iPad to Wi-Fi
Open Settings
Tap your name at the top
Tap iCloud
Tap iCloud Backup
Turn on iCloud Backup if it is off
Tap Back Up Now
Keep your iPad connected to Wi-Fi until the backup finishes
To back up to a computer, connect your iPad to a Mac or PC
On a Mac with macOS Catalina or later, open Finder
On a Mac with macOS Mojave or earlier, open iTunes
On a Windows PC, open iTunes
Select your iPad
Choose Back Up Now
Wait for the backup to complete