Yeah, I have an issue with this as well. Is there no way to split the fxt files into parts like months and just checksum the month and if it hasn’t changed, don’t delete the month data for the fxt file that exists. I know it would be a hassle, but I figure if there were a “bookmark” of some sort that is different from anything else in code, the separations that need to be made could be a lot more easily for you? Either way, this is an awesome tool, and if it had this one feature, I could store fxts on an external hard drive and move into tester the pairs, months, etc. when needed and not have to export entire EURUSD history every time I want to test a new robot, since on my present system I don’t have place for all 28 pairs total history in fxt format like I need.