Do you mean the Sell Your Item Form?
If you write a listing, but do not list it, the next time you open the Sell Your Item Form the incomplete draft will be on the first page.
Hmmm. This is true of the Advanced form. As a new seller you are automatically shown the simplified form, and I'm not sure if the Draft is held on that one.
I save all my descriptions on my desktop. I just write them all in a TextEdit (open office) document and save them in a desktop folder. Been doing this since 2001. I have a LOT of saved descriptions.
My descriptions also have the HTML coding in place and saved.
I don't usually save pictures, although I could, but I prefer to use a scan of the exact item I am selling rather than a stock picture.