If I understand you correctly, all you need is to backup (save) your Safari bookmarks file, for use in another copy of Safari? then just save a copy of the bookmarks file to a disk, or in a safe place. File is found in your user/Library/Safari folder, the name of the file is 'bookmarks.plist'.
This file can then be copied to the same folder on a different Mac, for example, to create identical bookmarks lists on several systems.