How I can save the Skype chat history from my iPad?

How I can save the Skype chat history from my ipad? It does not matter in what format, for example as a text file. In my ipad, I have a chat history, which is very important for me. This chat history includes several years of communication (so to copy it manually is extremely difficult, because it is impossible to select and copy a large amount of text in Skipe on an iPad, but only one message at a time). I still don't update from iOS 6.1.3, in order to avoid losing this chat history. I can not find the answer anywhere.