Can this be done, that tokens are backed by waves or is this already done?
Like you put 100k waves into a token and create let's say 1million tokens. And that 1 million tokens could be exchanged any time for 100k waves (so 1 token to 10 waves) - and price of tokens would be relative to waves price also.
Is that possible or not?
To create a token, it cost 1 Waves.
The value of your token is decided by the market.
If you want to decide the price of a token, then it's an ICO.