If you are using the Neo4j Desktop instance, you can click on the options (3 dots) to the right of the database and select Dump from the menu. As you have discovered, it will not overwrite an existing dump file but you can change the name of the file (e.g., add the date). Earlier versions of the Desktop dump function used to include the date/time to the file name, but that naming convention was removed several versions ago. I will periodically dump my database for recovery options as well as if I'm doing an upgrade of the database version.