1. A method comprising: receiving requests from one or more computing systems to store respective data items; in response to receiving the requests, storing information about the data items in a data structure, the information comprising, for respective data items, attributes indicating one or more of an owner of the data item, a size of the data item, or a type of the data item; and initiating, by a computing system, forwarding of the data items between computer system nodes in a network of computer system nodes without storing the data items on any fixed storage medium in the network, wherein computer system nodes to which the data items are respectively forwarded are determined dynamically based on statuses of respective computer system nodes and/or one or more statuses of the network.