My ignorance led me to believe that if I used BT Cloud, all my files would be duplicated in the Cloud - not on my PC. But I seem to have everything, about 400 gb in all, duplicated on my hard disc. Is this correct as if so I think I may have to find another way to back up my stuff before I run out of all the space left on both PC and Laptop.
BT sync, does this by default. Go into the windows app and on the sync tab unckeck the devices. This will delete all the duplicated files on your PC in the "BT Cloud folder" but leave them on the cloud server. Remember though that if you add any other devices you will have to uncheck them to prevent it doing the same thing.