> %windir%\system32\inetsrv\appcmd.exe add backup “My Backup Name”

to restore that backup, run this command:

> %windir%\system32\inetsrv\appcmd.exe restore backup “My Backup Name”

to delete a backup, run this command:

> %windir%\system32\inetsrv\appcmd.exe delete backup “My Backup Name”