Encrypt backup password
Never set up an encrypt backup for my iPhone. Now can't access backup without a password I didn't set up? Help
MacBook Air 13″, macOS 10.15
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You can’t restore an encrypted backup without its password. With iOS 11 or later or iPadOS, you can make a new encrypted backup of your device by resetting the password. Here’s what to do:
On your device, go to Settings > General > Reset.
Tap Reset All Settings and enter your device passcode.
Follow the steps to reset your settings. This won't affect your user data or passwords, but it will reset settings like display brightness, Home screen layout, and wallpaper. It also removes your encrypted backup password.
Connect your device to the Finder or iTunes again and create a new encrypted backup using the steps above.
You won't be able to use previous encrypted backups, but you can use the Finder or iTunes to back up your current data and set a new backup password.
Check here: https://support.apple.com/en-us/HT205220