hi from where i can turn off backup encryption

Hi,

To turn off backup encryption, untick the Encrypted backup box in the Finder or iTunes and enter the password. If you can't remember your password, you have two options:

• If you have an iCloud account, you can use iCloud to back up and restore.
• Use the steps above to reset your backup password.

---> https://support.apple.com/en-gb/HT205220#off