Tap Reset All Settings and enter your iOS passcode.On your iOS device, go to Settings > General > Reset.With iOS 11 or later, you can make a new encrypted backup of your device by resetting the password. You can't restore an encrypted backup without its password. That easy-to-remember passcode is potentially an easy-to-guess key to your iPhone. While certainly convenient for iPhone users - a four- to six-digit passcode is easier to remember than a full password - the concern here is the ease with which an attacker could compromise your data. Now, you can update your password if you forget it using your iPhone's passcode. Before Apple's change in security tactics, if you forgot the password, you had no way to get it back, and you'd be forced to factory reset your iPhone. If you should ever backup your iPhone onto another computer, it would retain the same password - no matter how many times you backed up your iPhone or switched computers. When first setting up encrypted backups in iTunes, you create a password specifically for the backup which protects all your data.

Forgot my iphone backup password