Back up, how to?

Hi, I am migrating from Lightroom to DK and RawTherapee So far I like it, the documentation is top notch.

I have a question on backing up the
I read that article. I am in windows 10, I can’t find that file. I have v8.0.
PIXLS.US Blog - Quick digiKam Tip: Back up digikamrc file

Thanks.