Here is the result of that RMAN command:

RMAN> list copy of datafile 1, 2, 3;

using target database control file instead of recovery catalog

List of Datafile Copies
Key File S Completion Time Ckp SCN Ckp Time Name
------- ---- - --------------- ---------- --------------- ----
30 1 A 24-AUG-07 5011977798 23-AUG-07 +FLASH/ax/datafile/sys
tem.2130.631249999
32 2 A 24-AUG-07 5011977798 23-AUG-07 +FLASH/ax/datafile/und
otbs1.2123.631249633
23 3 A 24-AUG-07 5011977798 23-AUG-07 +FLASH/ax/datafile/sys
aux.2127.631249883

RMAN>

SYamntec BAckup Exec does backup files onto the tape unit. Thanks for your help!