After restarting, try to make the backup again.
Unplug everything from your computer except your iOS device, keyboard, and mouse. Make sure you plug your iOS device directly into your computer.
If iTunes for Windows stops responding or your backup never finishes, you might need to update, configure, disable, or uninstall your security software. Learn more if iTunes for Windows isn't responding.
Try resetting the Lockdown folder to start or save a backup.
If you own more than one, try making a backup on your other Mac or PC.
If iTunes can't make a backup of your device because there’s not enough free space, try freeing some space on your Mac or PC. Then follow steps to make a backup again.
i tired all this step but still same error