A system includes determination of a resource stored in a cloud storage service, identification of a first cloud service associated with the resource, determination of a first pre-backup callback and a first post-backup callback associated with the first cloud service, transmission of the first pre-backup callback to the first cloud service, reception of a return of the first pre-backup callback from the first cloud service, transmission, in response to receipt of the return, of an instruction to the cloud storage service to backup the resource, and transmission of the first post-backup callback to the first cloud service.