The most important historical data to test is the most recent data. Trying to test data from 1970 or even 1990 has proven to be of little value as much of the world has changed in a significant way. Keeping your database current is simple using the FxTickData application. Each week new data is added and available to active subscribers via the desktop FxTickData application.
To keep your forex database up to date highlight each pair and select “Download Available Data” once per week. The database is updated at the beginning of each week and includes forex market data up to the close of the previous market week.