I got wii today with the intention of hacking it. So, I downloaded Super Mario 64 and I got a couple savs and transfered all that info on my sd I then put it in my pc and found the wii will be easily hackable. The whole thing is really organized and extremely easy to back-up saves to your pc or in the future easily hombrewable. I deduced that when you select a wii channel It goes through these folders to find the bin file:
Private-Wii-Title-(then any saves or Vc games)-(then a .bin)
Once it finds it it will boot it. So I bet you can easily figure out which bin is which save and back them up on your pc. The same with vc title. Then I bet you could just switch one save for another and one vc game for another or a homebrew app.