2022-12-02 10:58:34.481 WARN LIST_FAILURE Failed to list subdirectory QB/System Volume Information/: open \\?\C:\DATA\QB\System Volume Information: Access is denied.
2022-12-02 10:58:34.513 WARN OPEN_FAILURE Failed to open file for reading: open \\?\C:\DATA\QB\file.qbw: The process cannot access the file because it is being used by another process.
2022-12-02 10:58:34.514 WARN OPEN_FAILURE Failed to open file for reading: open \\?\C:\DATA\QB\file.qbw.TLG: The process cannot access the file because it is being used by another process.
i suspect the issue is with vss on the remote location (via symlink), as the only other failure is for currently in use files (which normally were backed up when they were on local file system).