James,
Backing up a folder on a shared drive to a drive directly connected to that machine will result in the QRecallHelper quiting and then erroring out.
The log shows a Lost connection with command/Connection with command process closed/process exception prior to the following:
Unable to connect with helper/cannot establish a connection with helper/Bug exception/Port: QRecallHelper.26334873
Let me know what else I can share with you.
Joe