Source namespace and file copying: a namespace service receives request to copy namespace to destination, identifies namespace update for file in namespace, and communicates namespace update for file to destination. An access object service receives request to copy file to destination and identifies group identifier for fingerprints group corresponding to sequential segments in file. The access object service communicates request for fingerprints group to deduplication service associated with group identifier range including group identifier. The deduplication service communicates fingerprints group, retrieved from fingerprint storage, to access object service, which communicates fingerprints group and identifier to destination. The access object service communicates request for file segments, corresponding to fingerprints missing in destination, from destination to deduplication service. The deduplication service communicates requested segments, retrieved from source storage, to access object service, which communicates requested segments of file to destination, enabling destination to store namespace update for file in namespace data structure.