just writing to let you know, we have our own instance of etherpad running allowing us to quickly draft emails and work collaboratively on any kind of short text based documents. Just create a new document and share the link with anyone, you want to have in the loop (for e.g. by posting it here on the forum or sending them an email).
As etherpad only holds stuff in memory, it looses everything by every start (which was one of the many issues I had with it, as it kept restarting). So I am afraid even with the image-file, we won’t be able to recover this. I’m sorry .