Immutability does reduce the problem by reducing the data footprint of stuff that needs to be synchronized. So let me guess: They're doing a distributed metad

Immutability does reduce the problem by reducing the data footprint of stuff that needs to be synchronized. So let me guess: They're doing a distributed metadata store where the cloud is the tie-breaker combined with flexible caching of immutable content-addressable (identified with SHA512 or similar) objects. In that case it sounds like cloud-hosted-only ipfs plus a nice client to access it from a host. Cold? Warm? :)