How to obtain repository snapshot

Hi,

I see here at this link https://en.opensuse.org/Package_repo...e_repositories a reference to:

• If you have enough disk space, you can also download a repository snapshot, but be advised that this can take up to 20Gb or even more.

How is this repository snapshot obtained? I do not want to mirror. I just want the latest copies of the files from the OpenSUSE 12.3 Update repository to upgrade an offline system.

Any help would be greatly appreciated!

Thanks