FAQs and other general questions are answered here
By dollaryen

Is it possible to recover bet history that I have deleted by mistake, are the bets kept anywhere on the hard drive.

It's very dangerous having the "delete selected Bets" and "delete all bets" buttons next to each other, easy to press the wrong one.
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By BfBotManager
Sorry to hear that, there is no option to recover deleted bets.

You can export all bets to the CSV file and then you can analyze it in Excel or other similar programs. That is the best way to keep your bets history over long periods of time.