This is one of the few times I have ever disagreed with you OMM. With $5K in account, ES overnight margin on one contract is like NQ. It will come out to $4,950 through the close. If the position is down $51 at the close, would the broker not liquidate? This was the general idea...to test to see what the broker would do. What they do on micro they would do on full-size, yes? How would Lightspeed handle that situation? This is why I suggested a single lot in a micro, it gives wiggle room for such a small account.
1st, our minimum is $25,000. He is basically saying that he wants to be long/short for a few days. He is only exiting the position to not icurr a margin call overnight, If his equity is higher than the margin, exiting the position does not make sense. If one contract is too much risk for him during the day, it is too much overall. The risk between the end of trading and a few hours trading later is not generally the most volatile time, except Friday to Monday.
You could invest in copper ETFs but I'm unfamiliar with those. I do know FCX, which I own, is highly correlated to copper as well as oil and gold. Copper falls, FCX will certainly be down half a point or more.
I will give you a better answer. Asumming that you are a market genius and you have trading in your blood, market fluctuations and simply some bad luck will kick you out of the market with 5K. I say you need 25K-50K to comfortably trade one contract and handle losses. But that is me.