The " tcopy " tility used to copies the magnetic tape mounted on the tape drive specified by the source argument. Simply, the " tcopy " used for copies one tape to another tape.
Rewind the tape first
# mt -f /dev/rmt/0 rewind
# mt -f /dev/rmt/1 rewind
And then " tcopy "
# tcopy /dev/rmt/0 /dev/rmt/1
Note
rmt = raw magnetic tape device