我问过TJ,下面是他的回答: ------------------------------ Force Backfill by design overwrites data existing in the database upto number of bars defined in File->Database Settings. That is purpose of backfill - to fix any possible errors/bad ticks /etc. Make sure that File->Database Settings as 'Local data storage" set to ENABLED otherwise local database won't keep data. This is all explained here: http://www.amibroker.com/guide/h_workspace.html and here http://www.amibroker.com/guide/h_rtsource.html Best regards, Tomasz Janeczko amibroker.com
Also, I can't backfill expired contracts from IB. But, I can backfill expired contracts with Multicharts with IB as a datafeed. Does anyone know how to do it?