BackUp iphone without encryption

Hello,

I have an iPhone 4S and I backed it up with a password (encrypted) in iTunes. Then, I restored my iPhone and since I didnt know the password of the Back Up, I used the icloud back up to restore it. Now I want to use iTunes do back it up but in the settings, the back up is still encrypted. I tryed deleting the backup and doing it again but it is still encrypted and i can't remove the encryption because I don't remember the password.

I would like to know if there is a way to cancel the auto back up and to start doing it again without encryption!

Thanks for the help