How Do I hack My Nintendo DS?

Simple,all you need is a flashcart.A flashcart is a cartridge pretty much like a dummy game cartridge with a micro SD slot.

How do i play backups?

1.First buy a flashcart,MAKE SURE IT WORKS ON YOUR SYSTEM FIRST!!(check flashcart manufacturers website/packaging) I would recommend either acekard 2i or supercard dstwo(great if you like emulators), original R4 (also great emulator support) are also very good if you can find one! but lack the support of the newer cards i mentioned.BUT LIKE I SAID MAKE SURE IT IS COMPATIBLE ESPECIALLY IF YOU HAVE DSI OR ABOVE

2.Download the latest flashcart firmware as explained in my guide

3.Buy yourself a micro SD card check the limitations on size on the flashcart packaging.

4.Format the micro SD to FAT32 (you will need an adapter to connect it to your pc)

5.Unzip the contents of the download using winrar or 7 zip (downloads available in guide)

6.Copy files to the root of the micro SD

7.Create a folder called NDS Games or Roms (it up to you what you call it) on your SD root

8.Copy you nds files (games/roms whatever you want to call them) to the folder you just created,just drag and drop.

9.Insert micro SD into flashcart.

10.Insert flashcart into DS

11.Your ds should autoboot to the flashcart firmware if you have a ds or dslite.If you have a dsi it will appear as a random game just press a to load it then your flashcart will boot

12.Select your game folder that you just created press a,then selet your game and press a to load it.Various options may be available in the way of game fixes you can access these usually by pressing y before loading on the selected game.It depends on your flashcart.

See the full guide here Softmod DS/DSLite/DSI Flashcart Firmwares