When you have no clue what the password may be, you can choose this option to try every possible combination of passwords. However, this method will take a longer time to find the password.

If you still remember the password, such as password length, character range, or affix, this option will be the best. It allows you to use these parameters to crack the password much faster.

If the iTunes backup password is one of the frequently used passwords and you are not sure which it is, you can use this method. You are allowed to import a text file of all possible passwords or use the default dictionary to recover the password.
Overview of Tenorshare 4uKey iTunes Backup Features

    Recover forgotten iTunes backup passwords quickly and safely
    Disable iTunes backup encryption within one click of new
    Remove Screen Time passcode without any data lossNEW
    Ensure a 100% decryption rate with advanced algorithms
    Compatible with latest iOS 13/12.4/iPadOS and iPhone 11/11 Pro/XS/XS Max/XR
    Advanced Decryption Technique
    30X Faster Speed with GPU Acceleration– Time-Saving

Technical Details and System Requirements

    Supported OS: Windows 10, Windows 8.1, Windows 7
    RAM (Memory): 2 GB RAM (4 GB recommended)
    Free Hard Disk Space: 200 MB or more