I'm asking myself the same question...Don't have a blank sd card right now. Is there a safe way to backup and restore properly the Emunand files on the micro sdcard? Can we just copy all the files on the SD to a folder on a pc?
I did this yesterday with no problems:
Just follow these steps if you only have ONE microsd card in the N3ds, and 1 microsd in the Gateway card.
NOTICE!!! This is ONLY for getting the mset exploit installed to avoid needing a CN/Zelda game cart to load Gateway each time! If you want to do the DS bluecardfix, see another users guide for that. (I chose not to install that)
Steps:
1. Locate a valid DevMenu.3ds file (search posts to find the correct hash code if u run into problems during step#8)
2. Erase old launcher file on internal SD card, and put the 3.2.1 launcher on it, and the correct MSET region version .cia file as well.
3. Place the Devmenu.3ds file on the Gateway microSDcard
4. Boot up gateway menu using your CN/ZeldaOOT method.
5. In the Gateway menu, scroll right to the "Install NVRAM" and run that, following the prompts. When it's done, it should bring you back to the Gateway menu.
6. Swap out your exploit game cart, for the red Gateway cart.
7. now HOLD the "B" button, and you should see the text saying "Boot into emunand" change into "Boot into systemnand" (If you let go of "B" the text will revert)
While holding "B" tap "A" with another finger, and it will ask u to confirm with "X". (you can let go of B now) Tap the "X" and Gateway will boot into Sysnand.
8. press select and choose the Devmenu "game". When it starts, move over one tab to the right, and locate the MSET.CIA file and install that.
DONE!!! Once it's done with that, exit out/power down the N3DS, and restart it. You should now be able from the home screen go to system settings, profile, DS Profile and emunand will launch with only the Gateway card needed in the cartridge slot from here on out. (or until u run a DS cart, unless you do the bluecardfix "stick" method, explained in other posts)
Hope that helps!! :-)
Your emunand question: copying/drag drop files doesn't work like that in windows, to backup the emunand. (unless i'm mistaken)
I would use the free "win32 disk imager" (called something like that) which lets you image the entire memory card to PC and vice versa. Only negative is it's a 1-1 copy, so a 8gb card will take up 8gb on your PC. But it's basically a foolproof way in case the memory card gets hosed or some file structure wiped for some odd reason. :-P