I was looking for something like this the other day and found a mine-field of services which seemed like they never went anywhere. Sometimes I would like to be able to throw up a site where I can create content using something like Editorially, have automatically backed up and not have to mess with everything else involved in running a site and making sure content is backed up.

I was looking for something which could run Markdown files from Dropbox (and pick the folder from which they are pulled.) I would also like to be able to make posts (or even the entire site) private if needed (publishing workflow.)