Only loosing unsaved data of the current browser session, or saved data too?

Ref. the following formulations on the project page:

1. When you use drag-and-drop to re-order the items, and the row you're dragging has the editor enabled, you may encounter problems depending on the editor you use. For example, with tinymce, you lose data. With fckeditor, you get slow and annoying refreshes.

2. When you click "Add another item", you lose data typed into the other items' enabled editors since the node was last saved or the editors were last disabled.

Please clarify whether there is a risk of loosing data that has already been saved (exist in the database), or if this only affects unsaved data in the same current browser session.