Take a look at the Trading System / Backtesting Videos on Investor/RT at
www.linnsoft.com/videos. You can use Investor/RT with DTN IQFeed, and get 1.5 years of 1-minute data on ES (for instance) from DTN. Investor/RT will run you $79 per month for the Pro Backtester version. And if you need any help putting your system into Investor/RT, I'll be glad to lend a hand (I've been coding systems in IRT for 10 years).