I like the SD card copier that is now built into the new Pixel desktop but after I copied my working model SD card onto a new card for backup, I made some important changes and decided to go back and make the copy again. It won't work. I get a message that it "Couldn't create partition" and fails. So I have to pull the card out, format it in my desktop computer and then do it again in the pi using SD card copier. Seems to me that there should be some way of reformatting the target SD card from the GUI desktop so that I don't need any hardware but my pi involved in this process. Since the SD card copier is a nice little GUI type program then either the ability to reformat should be built into it or else another small GUI program should be provided to do that task.