I've been looking at the data persentnce and data stores on the wiki I couldn't find anything! Thanks :)
Data Persistence is deprecated and shouldn't be used.
Data Stores in Universes act like Data Stores in any other game, they're simply shared between the various Places that make up the Universe.
Data store and PlayerDataStore module are two very useful wiki pages for Data Store usage. Please ask a more specific question if you need any more help.