The vcduser option specifies a VMware vCloud system administrator account name.
This option is valid for Windows clients that are configured to perform vCloud Director vApp backups.
This option is valid for Linux clients that are configured to perform vCloud Director vApp backups.
You can set this option in the client options file (dsm.opt). However, storing credentials in clear text is not a best practice. Alternatively, set the vcdhost option in the client options file. Then, include that host name and the vCloud administrator name, and the vCloud administrator password, on a set password command and specify the type parameter as TYPE=VCD. All three of these credentials are required to use the backup vapp or restore vapp commands.