Are there any different between forex data and forex futures data? Does the forex futures mirror the forex or there are alot of different? How abt using forex data for backtest to trade forex futures
Forex futures are exchange-traded FX fwds. You should be able to play with both, but only if you understand the difference between spot and fwd.
On average what are the different in terms of min variation? Like eurusd the min is 0.0001 would the different more than 0.0005? Would backtest result be very different if using daily bar?
Let me say it again... You're comparing a spot instrument to a fwd instrument. It's like saying there are minor differences between the cash Spooz and the ES future. As a specific example, the spread between EURUSD spot and the front EURUSD future has varied between -1.2 and 1.7 big figures (I mean -0.012 and 0.017). The spread is extremely small and stable at the moment, because rates everywhere are so low.