You can use secure copy protocol (SCP) to download the configuration file from the FortiGate unit as an alternative method of backing up the configuration file or an individual VDOM configuration file.
This is done by enabling SCP for an administrator account and enabling SSH on a port used by the SCP client application to connect to the FortiGate unit.
SCP is enabled using the following CLI commands:
> config system global > set admin-scp enable > end
Use the same commands to backup a VDOM configuration by first entering the commands:
> config global > set admin-scp enable > end > config vdom > edit <vdom_name>