Graphlytic uses Neo4j database as data storage of customer data (application settings and data are stored in internal DB outside of Neo4j). You can use existing Neo4j database or install a new one. If you use exiting database be careful that Graphlytic stores some custom data into Neo4j database. Existing data stays unchanged because Graphlytic don't execute any change to existing data if it is not required by user. For better safety and data separation we recommend to use separate Neo4j database to work with Graphlytic. For information about required version see Requirements.