Which exactly is the "duplicate" then (what do you mean)? The questions that was closed, the question that was left open, or something else?

Should I rather post the previous comment as a question?

thanks, so if I understand correctly a duplicate is a question that already has an answer fitting the question somewhere else (as the infobox says), right? Or are there other reasons a question should be marked as dublicate?

@fixer1234 Not more then a few weeks, the question in question isn't there. Thanks for the suggestion! oh, nice rhyme... :D

that's it, thanks. Is it possible to view my question that have been deleted? They don't show up in my question list.

Might be an option for some pictures, but this way an external image stays external and is lost if the website or the url to the image changes.

That argument doesn't fit the main goal of SU: creating a knowledge base