Wii save files to Wii U

Hi there,

I am about to buy a Wii U, but I have brothers that still play the games on the Wii

Is it posible to transfer the saved data from a Wii to an SD card, puting them back in the same Wii (since they are automatically removed) and only then to the Wii U?

I need the saved files in both consoles.

Thanks in advance