Re: backup note pro to external hard drive
Plug microSD plug end of an OTG cable into your phone, plug the USB end of the OTG cable into your external storage device with its own power source, select the files you want to transfer, choose MOVE in the popup window.
Note this doesn't allow to move whole files, only individual files one at a time, or in groups so create similar folders on the external HD before you start to move the files off the phone.
There are more efficient methods but this one requires only the OTG cable in addition to the phone and the HD.