I just took a backup myself to check that it wasn't me going mad and it worked flawlessly. Here it is again with pictures:
1) Insert SD card and check the drive letter it has been assigned.
2) Select that drive letter from the 'Devices' drop down menu.
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3) Click on the little blue folder.
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4) If it's easier you can use the 'Downloads' folder for now and then move the file elsewhere later on. Enter a filename in the box indicated by the arrow. Click the 'Open' button.
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Something I forgot to mention last time is that the file name must be followed by '.img'. For example, my filename is: RuneMod24-02-2018.img. If you like you can just copy that filename into the box.
5)
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6) It is best to eject the SD card before taking it out to put back in the Pi. There is a little device symbol in the taskbar. Right click and select 'Eject SD'
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Hopefully that's clearer. It works for me so no reason you can't do it.