Reference: Encrypt_Files
This field captures the encryption key that will be used to encrypt the archive. The key is used when an archive is newly created, or when you wish to change the key associated with a given archive. The logic is as follows:
• If the archive file does not exist, apply the primary value of the specified key name.
• If the archive file already exists, and no key name is specified, determine the key that was originally used and apply the primary value of that key.
• If the archive file already exists, and a key name is supplied, apply the primary value of the new key.
This allows you to easily modify the key in an existing archive file.
Warning: Do not use a key that is also being used for Beyond FTP server communications! These keys may be updated and changed in ways you do not expect. ALWAYS USE A KEY WITH A KNOWN PASS PHRASE! This will prevent key retirement or secondary key demotion from making your archive inaccessible!