I very often create articles in two languages. It would be so much easier if in WordPress there is a feature like “Save as…”. But it is not. Selecting everything by pressing CTRL+A very often selects only one paragraph or everything – see pictures below:
Then you open a new article, and paste the article using CTRL-V shortcut. You will still have to add manually all tags etc. However the text and all pictures will get copied correctly without duplicating them in the media library.