Just to offer another perspective, I thought backcountry was an American/Canadian term for undeveloped wilderness. You might park your car in a car park and hike or canoe all day through an area that has not been economically developed. It was my impression that if you’re, for example, an hour’s walk from a human settlement or if your walk takes you mostly past grazing sheep or along logging tracks through a managed forest, then that wouldn’t be considered backcountry.
As a result the tag backcountry=yes has barely been used in the UK (< 100 uses), because people generally wouldn’t use the word backcountry to describe the countryside, and because backcountry in the US sense doesn’t really exist. (It’s hard to find true wilderness that hasn’t been touched in one way or another by human activity.)
So I am surprised to see it’s been used in Denmark and I wonder what for. Do you use it for any campsite that you can’t drive your car to?