Thanks Big Red. Not Dropbox but the folder is being backed up on P-Cloud. It's been set up like this for a good while but only giving me trouble this month. Anyway, I've copied the company files to a folder not attached to P-Cloud and seems to be working OK. Bummer, because I'd like to back these up as easily as I back up the rest of my personal files.

I'm sure you've nailed it. Looking in the P-Cloud folder I see 15 instances of each company file all with various quantities of [conflicted] stuck in the file name. Do you have any idea why this is only happening with QB files and not anything else in the P-Cloud backup?