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#11
Volume Shadow Service. It is how Macrium can backup a running windows system. It is part of the OS and makes a snapshot. It is the snapshot which is then backed up while the system is running and changing things. When you boot from PE no such step is required as the Windows installation is not changing.
The CAPI2 error you are getting is due to security settings in the System Writer (which is part of VSS) and can be fixed as described above by changing authorities. Its been going on for years and is still not fixed - it breaks again every upgrade....