Continuous backup?
Users of MongoDB can get continuous backup using Ops Manager (self-hosted) or Cloud Manager (fully managed). Both use the same underlying software.
Ops Manager continuously maintains backups, so if your MongoDB deployment experiences a failure, the most recent backup is only moments behind, minimizing exposure to data loss. Ops Manager is the only MongoDB solution that offers point-in-time backups of replica sets and cluster-wide snapshots of sharded clusters. You can restore to precisely the moment you need, quickly and safely.
Source: https://www.mongodb.com/products/ops-manager
The MongoDB documentation has more details about how Ops Manager Backup works.
Are there any plans to create similar functionality for RethinkDB?
Source: rethinkdb/rethinkdb