My 3DS SD card-- with 6 years of Save Files-- got Corrupted a few days before the e-shop shutdown. I was despondent and angry for a couple of days... but I had
3DS Hacks - Installing Games and Homebrew Apps - CFWaifu
How to Backup and Install Your 3DS Games from Cartridges - YouTube
Using Checkpoint - Managing 3DS Saves - Project Pokemon Forums
How to transfer 3DS SD card data and use high capacity (bigger than 32GB) microSD cards on the New Nintendo 3DS XL
Unlimited SD Card Backup in the Field - Hard Drive Hack : 6 Steps (with Pictures) - Instructables
Nintendo 3DS firmware update adds SD card save data backup - Polygon
Help with pkhex and 3DS titles - Saves - Editing Help - Project Pokemon Forums
Backup / Restore 3DS System with GodMode9 - CFWaifu
Using Checkpoint - Managing 3DS Saves - Project Pokemon Forums
should I update my 3ds? it's already hacked and I have a backup of the sd card. : r/3dspiracy
How To Make A Backup File For A Jailbroken Nintendo 3ds/2ds XL - YouTube
3DS GBA Save Backup and Restore with GodMode9 | Digiex
How to Transfer 3DS SD Card Data
Nintendo 3DS Nand Dump / System Nand Backup [3DS, 3DS XL, 2DS, New 3DS] | Digiex