The term "world backdated file" refers to a file or document that has information that should have been updated but was not. Synonyms for this phrase include outdated document, expired record, antiquated paperwork, and old-fashioned file. Other terms that may be used to refer to a world backdated file include vintage document, stale record, ancient paperwork, and retro file. Regardless of the term used, the commonality between all of these synonyms is that they describe a document that is no longer current or relevant due to its age or lack of updates. It is important to keep documents updated to ensure accurate information is being used.