BT cloud used to work fine.
Recently I noticed that it never completes file transfer, it is trying to transfer ~60K files. They seem to be mainly system files, not user files. For instance ~/appData/local/Adobe/Acrobat/DC. User files do appear to be sync'ing correctly. I also have oneDrive setup. I've tried obvious things like reboot, leaving it a long time with no other activity.
It is taking 50-100% CPU, so desktop is running very slow, and pretty much unusable.