The Copy Back Data Queue command is intended for refreshing a data queue or
duplicating the entries to a different data queue. You must first convert the
entries in the data queue to the DTAQP file with the TAA CVTDTAQ command.
CPYBCKDTAQ then reads the data from the DTAQP file and uses the QSNDDTAQ API to
send the entries to a named data queue. Both keyed and non-keyed data queues
are supported.