I am running into a similar situation and am trying to figure this out.  In the meantime, what I've done, once all users have closed out of Quickbooks, is copy the company files directly to another location on the hard drive as well as to a different computer.    This way I still have a backup of the company files even though the automated process is not working. 

I know this does not solve your issue, and you may already be doing something similar, but wanted to offer this option in case you have not considered this. 

If I find anything else out I will let you know.

I noticed this happening on both a Windows 7 and Windows10 pc.