REPLACE is an optional parameter used to specify that the recovered backup version or dump copy of the data set replaces any existing data set with the same data set name on the receiving volume or on any volume if the data set is cataloged. If you specify NEWNAME and the new name is the same as the name of an existing data set, you must specify the REPLACE parameter or DFSMShsm does not process the HRECOVER command for that data set. The data set being replaced is uncataloged (if it was cataloged) and scratched.