Q: in itunes

"There is no way to recover your information or turn off Encrypt Backup if you lose or forget the password."

From here > About encrypted backups in iTunes - Apple Support

You create the password for the encryption. If you want to encrypt a backup, you create the password. If you are referring to the fact you may have forgotten the password for an encrypted backup, you will have to delete the encryped backup from iTunes, remove the checkmark for encryption in iTunes, and then restore the phone to new, not using your backup and then you can backup again without encryption. About encrypted backups in iTunes - Apple Support