UNSAFE (don't try!)

I was so happy to finally find a good plugin for a survey. But I am SO disappointed. I run quite a big blog, so in a few hours my survey got a lot of response. But every time after 150-200 responses the survey gave an error. I lost in total 500 responses (!!) without any back-up. Everything is gone. ?? I’m never using this again. I tried to get in contact with the maker of the plugin, but no response either. Do not use this, it’s crap. ??