BACKUP ARCHIVELOG ALL NOT BACKED UP

RMAN> backup archivelog all not backed up;

Starting backup at 18-SEP-18
current log archived
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=404 device type=DISK
skipping archived logs of thread 1 from sequence 5 to 32; already backed up
channel ORA_DISK_1: starting archived log backup set
channel ORA_DISK_1: specifying archived log(s) in backup set
input archived log thread=1 sequence=33 RECID=29 STAMP=987190933
channel ORA_DISK_1: starting piece 1 at 18-SEP-18
channel ORA_DISK_1: finished piece 1 at 18-SEP-18
piece handle=+FRA/ACME/BACKUPSET/2018_09_18/annnf0_tag20180918t194214_0.303.987190935 tag=TAG20180918T194214 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 18-SEP-18

Starting Control File and SPFILE Autobackup at 18-SEP-18
piece handle=+FRA/ACME/AUTOBACKUP/2018_09_18/s_987190935.304.987190937 comment=NONE
Finished Control File and SPFILE Autobackup at 18-SEP-18

RMAN>