Backing up your Loopstation from time to time can be very important, and the task is easier than you might think!
1st:
Get a USB-B Cable (printer cable) and connect your MK2 with your Laptop/PC.
2nd:
Open the menu (with the menu button) and scroll one to the right (with the right arrow button). There you can activate the USB-Mode. Now wait until the Loop is displayed on your Laptop/PC.
3rd:
Browse to the RC505/Roland Drive that just appeared in your Laptops File-Explorer and open it.
4th:
Just copy the Folder in that drive onto an external drive and end the USB-Mode of the MK2 with the "Exit" button.
-- That's it --
If you want to load a backup, just replace the Folder in the Loopstation-Drive and you're done.