Once iTunes is set to encrypt iPhone backups, switching this feature off requires the password. http://www.windowspasswordsrecovery.com/product/iphone-backup-unlocker.htm
What if the password is forgotten or unknown? Can you still turn off the iPhone backup encryption? As a matter of face, there is no way to turn off the password if you dont get the password at first. How to get the lost password on iTunes? Yes, this is the most important thing. So far, there is only one software designed to recover lost password on iTunes, get the free trial version to have a try.