Currently there is a very alpha Postgres appliance[0] (including automatic cluster orchestration and a database provisioning API) included with Flynn and we'll be standardizing the appliance model and adding more in the future. Flynn datastore appliances run inside of containers and are managed by Flynn just like everything else and will include support for backups, HA/replication, etc. out of the box with close to zero configuration.

[0] https://github.com/flynn/flynn-postgres