Because a Windows Server 2008 Server Core server does not support GUI tools,wbadmin.exe is the only tool you can use to perform a backup from the Server Core command line.

Name: Because a Windows Server 2008 Server Core server does not support GUI tools,wbadmin.exe is the only tool you can use to perform a backup from the Server Core command line.
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Quizplus · Accepted Answer

Since GUI tools are not supported in Windows Server 2008 Server Core, the only option to perform backups is using command-line tools like wbadmin.exe.

Because a Windows Server 2008 Server Core Server Does Not