Usage: WBADMIN START BACKUP -backupTarget:{TargetVolume | TargetNetworkShare} -include:VolumesToInclude -allCritical -noVerify ...

Usage: WBADMIN START BACKUP      [-backupTarget:{TargetVolume | TargetNetworkShare}]     [-include:VolumesToInclude]     [-allCritical]     [-noVerify]     [-quiet]  Runs a backup immediately using the specified options. When no options are  specified and scheduled backup is enabled, runs a backup of the scheduled  volumes to the scheduled storage location.  -backupTarget   Storage location for this backup. Requires drive letter or                  UNC path to shared network folder.  -include        Comma delimited list of volume drive letters, volume mount                  points or GUID based volume names to include in backup. Should                 be used when -backupTarget is specified.  -allCritical    Automatically includes all critical volumes, volumes having OS                 components in the backup. Can be used along with -include                 option. Should be used only when -backupTarget is specified.  -noVerify       If specified, backups written to removable media such as DVD                  will not be verified. By default, backups written to such media                  will be verified for errors.  -quiet          Runs the command with no user prompts.  Example: WBADMIN START BACKUP -backupTarget:e: -include:e:,d:\mountpoint,\\?\Volume{cc566d14-44a0-11d9-9d93-806e6f6e6963}\