There is a way to exclude some folders from being scanned by the WDMC process. However the process involves modifying some config files for wdmc and inturn voids warranty!!!
Only to be done if you are comfortable and have some linux knowledge.
Via ssh, look in this file: /usr/local/wdmcserver/bin/wdmc.xml
There you will find a section called “”. In there, you can specify which folders to exclude from the scan.
/\*/System Volume Information/\*
Once you have excluded the folders, delete the hidden “.wdmc” folder that contains the thumbnails in each respective provate folder. After that either restart the wdmc process or reboot the wd cloud drive.