I work at a somewhat well-known unicorn in the data space that has been using this architecture for a while. In fact I'd wager that any (non-cloud-provider) company that provides any significant amount of compute or storage in their product offering will converge upon a layout that closely resembles this.

Overall I'd imagine there are a lot of parallels to other SaaS-ish architectures, one big divergence is that I'd consider the data-plane to be a special kind of client, (client in the same way that a user's phone or browser is). The big difference is that we (the company) ALSO manage the lifecycle of this "client" (i.e. shutdown, startup, repair, update). Having an untrusted client that you also manage the lifecycle of can lead to some interesting design spaces.