Synchronization of a server side deduplication cache with a client side deduplication cache

A server computational device maintains commonly occurring duplicate chunks of deduplicated data that have already been stored m a server side repository via one or more client computational devices. The server computational device provides a client computational device with selected elements of the commonly occurring duplicate chunks of deduplicated data, in response to receiving a request by the server computational device from the client computational device to prepopulate, refresh or update a client side deduplication cache maintained in the client computational device.