One example method includes implementing a function as a service (FaaS) at a datacenter by performing operations including receiving an application program interface (API) gateway call from a client application, wherein the API gateway call is associated with an object PUT request, and automatically triggering, with the API gateway call, performance of an object insertion function. The object insertion function includes retrieving, from backend object storage, a previous version of the object, differentially compressing the object relative to the previous version of the object so as to generate a differential, and storing the differential in the backend object storage.