You can not get a true image while Windows is running. To get a good image your system needs to be in a stable state, which means that it has been properly shut down.
When Windows is critical system files are in a constant state of flux. Taking an image in such circumstances is like turning off your PC by killing the power.
There is a reason it is better for you to shutdown your PC rather than yank the cord out of the wall and the same principle's apply to DOS based vs Windows Based system backups!
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