I have for several years historical data, which I verified and do not want to touch. Data goes from 1998 until end of 2011 for example. When I run a strategy, being connnected to a provider, then my historical data is overwritten.
Same happens when I download with the historical data manager.
How can I avoid this? If I run a strategy (in strategy tab or analyzer) I do not want that existing data is overwritten.
thanks for your feedback
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