I meant that everytime you make a change in a page and hit save a new version of the page gets stored.
Yes, this is what I meant too and also the old versions are kept in case you want to revert back to it. But technically, in mojoPortal it will be versioning of content instances not pages since any content instance is possibly published on more than one page or content instances may not yet be published on any pages, but we will still keep every version of the content as it changes and will keep all history so that it is possible to revert to any previous version.
Best,
Joe