Any orders encrypted using a merchant key can only be decrypted with the matching key. If you loose the key, you will not be able to view encrypted order information. Prior to turning on Merchant Key Encryption, you need to make sure you Back up your Merchant Key to a safe, secure location.

For maximum security, your Merchant Key file should not be stored in a publicly accessible location. You should store the key file on a secure computer or a removable device you can keep secure. Backup copies of your key should be stored on removable devices that you can store in a secure location.