How to take backup of backupset in oracle RMAN ?

 RMAN> backup backupset all;

Starting backup at 24-MAY-25

using channel ORA_DISK_1

channel ORA_DISK_1: input backup set: count=78, stamp=1201960787, piece=1

channel ORA_DISK_1: starting piece 1 at 24-MAY-25

skipping backup piece handle /u01/app/oracle/fast_recovery_area/DB1/autobackup/2025_05_24/o1_mf_s_1201960787_n33n6o4x_.bkp; already exists

channel ORA_DISK_1: finished piece 1 at 24-MAY-25

channel ORA_DISK_1: backup piece complete, elapsed time: 00:00:00

channel ORA_DISK_1: input backup set: count=79, stamp=1201960815, piece=1

channel ORA_DISK_1: starting piece 1 at 24-MAY-25

channel ORA_DISK_1: backup piece /u01/app/oracle/fast_recovery_area/DB1/backupset/2025_05_24/o1_mf_nnndf_TAG20250524T140015_n33n7jcg_.bkp

piece handle=/u01/app/oracle/fast_recovery_area/DB1/backupset/2025_05_24/o1_mf_nnnnf__n33n7v8r_.bkp comment=NONE

channel ORA_DISK_1: finished piece 1 at 24-MAY-25

channel ORA_DISK_1: backup piece complete, elapsed time: 00:00:02

channel ORA_DISK_1: input backup set: count=80, stamp=1201960817, piece=1

channel ORA_DISK_1: starting piece 1 at 24-MAY-25

skipping backup piece handle /u01/app/oracle/fast_recovery_area/DB1/autobackup/2025_05_24/o1_mf_s_1201960817_n33n7m82_.bkp; already exists

channel ORA_DISK_1: finished piece 1 at 24-MAY-25

channel ORA_DISK_1: backup piece complete, elapsed time: 00:00:00

Finished backup at 24-MAY-25

Starting Control File and SPFILE Autobackup at 24-MAY-25

piece handle=/u01/app/oracle/fast_recovery_area/DB1/autobackup/2025_05_24/o1_mf_s_1201960828_n33n7y5b_.bkp comment=NONE

Finished Control File and SPFILE Autobackup at 24-MAY-25

RMAN>