Shadow Copy Service (Windows only)

FreeFileSync supports copying locked or shared files by creating a Volume Shadow Copy of the source drive. This feature can be configured via Menu → Tools → Options: Copy locked files.

Note

The volume snapshot created by the Volume Shadow Copy Service is only used when copying locked files.
Accessing the Volume Shadow Copy Service requires FreeFileSync to be started with administrator rights.

Troubleshooting

If you experience problems using the Volume Shadow Copy Service a renewal of registration might help. Create and execute a cmd batch file and insert the following lines or enter directly via command line:

cd /d %windir%\system32
Net stop vss
Net stop swprv
regsvr32 ole32.dll
regsvr32 oleaut32.dll
regsvr32 vss_ps.dll
Vssvc /register
regsvr32 /i swprv.dll
regsvr32 /i eventcls.dll
regsvr32 es.dll
regsvr32 stdprov.dll
regsvr32 vssui.dll
regsvr32 msxml.dll
regsvr32 msxml3.dll
regsvr32 msxml4.dll

Reference: http://support.microsoft.com/kb/940032