For command line use, read this article :
Windows Backup (sdclt.exe) VISTA/SEVEN command line parametters
INTRODUCTION
This is a little program that allow you to use Windows Backup tool of Windows VISTA or Windows SEVEN in command line, sample you can backup your system and datas at Windows shutdown or user logoff
INSTALLATION
Before all configure the "Windows Backup Tool (sdclt)"

1. Download and extract the files content in zip where you want.
2. Import content of registry keys stored in file "ConfigureBackupClosingSession.reg".
3. Open "Computer Policies" MMC console and go to "User Configuration => Windows Parameters => Scripts => Logoff Scripts.
4. Add new logoff script, for script application use "C:\Windows\System32\cscript.exe" and for parameters use "[your path]\StartWindowsVISTA-SEVEN-BackupTool.vbs"

4. Because Windows close it wait maximum 60 seconds before kill all applications, you must add a registry key or change GPO to force Windows to never close applications a shut down and wait indefinitely
4.1 Edit and change registry key to set value to "0".
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]
"MaxGPOScriptWait"=dword:00000000
5. Test application.

This is the content or registry file that i use
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System]
"HideLogoffScripts"=dword:00000000
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]
"HideShutdownScripts"=dword:00000000
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]
"MaxGPOScriptWait"=dword:00000000
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Group Policy\Scripts\Shutdown\0\0]
"Script"="D:\\DATA\\SCRIPTS\\BACKUP_DATAS.CMD"
"Parameters"=""
"IsPowershell"=dword:00000000
"ExecTime"=hex(b):00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Group Policy\State\Machine\Scripts\Shutdown\0\0]
"Script"="D:\\DATA\\SCRIPTS\\BACKUP_DATAS.CMD"
"Parameters"=""
"ExecTime"=hex(b):00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
WBADMIN : Utility will start an image backup of your system, system and boot volumes while it saves it to the d: drive.
http://technet.microsoft.com/en-us/library/cc742083(WS.10).aspx
Sample :
wbadmin START BACKUP -backuptarget:d: -include:c: -allCritical -quiet
Create Backups of the System State Using a Command Line
http://technet.microsoft.com/en-us/library/cc753201.aspx
DOWNLOAD

StartWindowsVISTA-SEVEN-BackupTool.zip (69ko)
StartWindowsVISTA-SEVEN-BackupTool (69ko) SPECIAL VERSION with (/DELETECATALOGANDKICKOFFNEW) instead of (/KICKOFFNEW)
VERSION
First version 1.1.0.0