If one starts a backup to computer of All Files in Filey, and cancels it in the middle, the app crunches on through every remaining file, creating individual red-outlined windows "Failed to copy file <>". This is slow but not terrible, but then those red windows obscure the column headings in All Files, and would require clicking on the "x" 800 times... Consider a summary window instead of individual red windows, or some way to clear all those red windows.