Hi everybody, I'm in my 30's and pretty new to the Wii (somebody gave me one for free). I'm a classic NES and SNES fan; I grew up with both. We got the NES with ROB the Robot for Christmas in 1986 and I've been hooked every since. Up until recently, I've had a really large collection of games (around 300) but I had to get rid of them; They just take up too much space
Here's a pic of some of my collection before I sold them all on ebay

I got the Wii for free and I know there's a Wii U out now... but I don't know very much about them. Here are the questions I have:
1) If you lose your hard drive, can you re-download all the games you've purchased? Does the store keep a history of your purchases?
2) How do you back up your games? SD memory card?
3) All the games I buy in the Wii store, will they work on the Wii U? For example, if they're all saved to a memory card and you put the memory card into the Wii U, does it work?
4) Is there a really good wireless controller for the Wii? Something like the SNES controller would be perfect

I will be heading to buy an SD memory card and the classic controller. As cool as having the actual carts is, they take up a lot of space. My wife was pretty pissed off because the 300 carts took 2 closets of space 
The games look and play great! I bought 50 bucks worth of games so far, gonna keep accumulating a collection. I really hope the Dragon Warrior series eventually becomes available