This isn't currently supported, although Sirius has some options that might be helpful. Sirius isn't really a data store per se; it's really a persistent, replicated update stream (transaction log) aimed at letting you build and maintain your own in-process representation of the dataset.
As such, you could set up a separate cluster running in "follower" mode, subscribing to the stream of updates and them writing them out to some other datastore.
As such, you could set up a separate cluster running in "follower" mode, subscribing to the stream of updates and them writing them out to some other datastore.