You can continue to store items in the database after they are deleted from a page, so that they can be restored. If you choose to retain deleted items you can also continue to display them in the page. To remove retained items permanently from the database you must perform a system purge.
To
retain deleted items, you must have at least one of the following privileges:
Manage All privileges on the page group
Manage All global privileges on All Page Groups
In the Navigator, click Properties next to the page group with which you want to work.
Click the Items tab.
Select Retain Deleted Items.
Click OK to return to the Navigator.