Jetspeed 2 gives you an user-friendly interface to import or export psml/link/folder from portal. Its doesn’t matter that you are using db or file system to store your pages. This feature is available in portal site manager.
For importing or exporting, you just need to select the node from tree structure and export or import option would be available in right side panel.
Export
Select any page, folder or link from tree in left panel and export tab would be available at right panel, if selected object is an folder, it will give you an option for exporting recursively, all object under that folder would be exported and available, as archive for download.
Import
For importing any object in portal, first you need to select the its parent in tree, after that select import tab from right panel and select any link, psml or zip file (in case, you wanted any folder need to import). Portal would import all valid object in tree.