FreeFileSync Open Source File Synchronization

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FreeFileSync User Manual:

Volume Shadow Copy (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 for copying files that are actually locked.
  • Accessing the Volume Shadow Copy Service requires FreeFileSync to be started with administrator rights.