Amazon Neptune now supports Streams to capture graph data changes
Amazon Neptune now supports Streams, an easy way to capture changes in your graph. When enabled, Neptune Streams logs changes to your graph (change-log data) as they happen. Neptune Streams are useful when you want to notify processes (e.g. trigger a lambda) as changes occur in your graph. Streams can also be useful to maintain a current version of your graph in a different region or service such as Amazon Elasticsearch, Amazon ElastiCache, or Amazon Simple Storage Service.
Source:: Amazon AWS