How do I manage memory cards (Gamecube) in Dolphin?

[Paratech]

Suppose I want to play a Zelda game, I have the game, etc, but I want to save the game to a memory card *virtual* and backup the file. How do I do that?

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Spoiler:

-Dreams of getting a new 360 XBOX in 201x.
-Current consoles:Wii, Slim PS2, also has 3DS / GBA SP and a PSP 3000

-PC: AMD Quad Core A8-3800 Accelerated Processor, 16GB DDR3 Ram, Radeon HD45xx 1 GB video card, 1 TB hard drive, 500 GB hard drive, Supermulti DVD Burner, Wireless Lan 802.11 b/g/n, Beats audio Studio Quality sound, Win 7 Home Premium

Yes, I like getting (primarily digital) games on sale @ bargain prices! don't like it? Just deal with it!