Technologies are disclosed for migrating large amounts of data objects, e.g., billions of data objects, from a distributed data store to another data store or computing device. A method includes generating an inventory of the data objects in the distributed data store and dividing the inventory into multiple listings of data objects. Each data object is identified in only one corresponding listing. Manifests are generated based upon the listings. Each manifest is assigned to a corresponding portable storage device of a plurality of portable storage devices, and the data objects and listings are transferred, based at least in part, upon the manifests to the plurality of portable storage devices. The inventory of the data objects and the plurality of portable storage devices are provided to an entity associated with the another data store or computing device. The data objects are transferred from the plurality of portable storage devices to the another data store or computing device using the inventory.