My Workflow saw then in the evening from always the case:
1. Insert the Micro SD card with SD adapter
2. Connect the external USB drive
3. Switch
4. Select with the app on your smartphone source files and destination folder
5. Start copying and wait (a few GB of video files need quite a few minutes)
6. Check whether copied successfully
7. Remove the SD card
8. Eject the SD card and USB drive
9. Switch off the device
The unit has always copied without error and was recharged by me in a week of vacation only once (for safety's sake).
The integrated LiPo battery has a capacity of 4900 mAh and the card reader understood with SD / SDHC / SDXC cards. Even my hard drive (USB3 / 2.5 "/ 1TB) with NTFS format could be easily described. The whole set of my backup plan is the ideal solution. Full marks!