The Ioto database operates in-memory with a lazy save to persistent storage.
When changes are made to database items, a save to storage will be performed after a configurable delay as specified in the database.saveDelay property in the config.json5 file. This is set to 1 second by default.
You can force a database save at any time via the dbSave API:
This will persist data changes to the database file specified via dbOpen. You can supply a filename as the second argument to save to a different (backup) database file.