Systems and methods to copy a plurality of source data records of a source client to a target client include deletion of a first set of target data records of a plurality of target data records associated with the target client, each of the first set associated with a key which is not identical to any key of a plurality of source data records, insertion of a second set of source data records into the plurality of target data records, each of the second set of source data records associated with a key which is not identical to any key of the plurality of target data records, and update of a third set of target data records associated with a key which matches a key of one of the fourth set of source data records and which is different from one of the fourth set of source data records.