I was translating a big article fron english wipedia to spanish wipedia.
I stored the changes (the article was very long, I remark ) using preview.
After some time writting, I tried to save the changes ( indicating " Manual translations ends here; it´s going to be continued") when appeared a DNS error.
I tried to go backwards and the broswer said me " Page has been expired".
So , I missed all the work.
For prevent it, I suggest create a third button named " Temporally save" or similar, to store the articles created by the author, without publish them.
So, later, after improving it, the author can publish it in the wikipedia.
Regards.