This morning I had bit problem with Apple Numbers because of its document autosave feature. In a meeting, I had to edit my document to see to effect of any input changes to the model. The meeting took nearly 2 hours and when it’s over I just closed my mac’s lid.
When I opened my mac, I’ve just realised that Numbers autosaved those changes and I couldn’t remember the original state of my document. To my surprise, I couldn’t find the document version on top of the document’s name in order to revert to previous document version.
OS X Mavericks handles this matter quite different to Mountain Lion. It’s actually so easy, yet you might easily skip this. Just look under File menu > Revert To.
This link might help you and to see what the different is between Mountain Lion and Mavericks,
OS X Mavericks: View and restore past versions of documents.
OS X Mountain Lion: View and restore past versions of documents.