On XP SP2 with Windows' own backup program it worked for me, I chose to backup the system state along with protected system files and I used the shadow copy method.
Check if you have "Volume Shadow Copy" and "MS Software Shadow Copy Provider" services enabled, and have required permissions (from Group Policy Editor).
Check if you have "Volume Shadow Copy" and "MS Software Shadow Copy Provider" services enabled, and have required permissions (from Group Policy Editor).
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