Whether your Wii is dying, you’re upgrading to a Wii U, or you just want to back up your hard-earned Universe Mode progress, moving Wii save data isn't always as simple as it should be. Specifically, WWE '13 presents a unique challenge.
You can now take this SD card to any other homebrew-enabled Wii or Wii U in the world, open SaveGame Manager GX, and select to inject the save data into the new console's memory seamlessly. Utilizing Portability: Moving to Dolphin Emulator
By having the save file on your computer, you can back it up before making any changes, guaranteeing that your original progress is never lost. If you download a pre-made save file (like a "100% completed" save from a website), you can then use the homebrew tools mentioned in the previous part to "install" this new save onto your console, effectively editing your game's state without any manual work.