As we transition to the new Hyland Community, some post links may be temporarily disrupted as we finalize redirects. We apologize for the inconvenience and are working to resolve this as quickly as possible. Details.
You can go to a space, and export all contents into another space, creating an ACP file (which is a zip). You can then download the file.
Additionally, there is an export tool. Have you seen this page? There is an export tool. http://wiki.alfresco.com/wiki/Export_and_Import