How lot take log backup using script in HANA

We have SAP HANA SPS09.

1) We are using script provided by SAP Note#1651055 to take the data backup.But it seems it is not taking log backup.HOw can we schedule logbackup ? or we have to use DBACOCKPIT or Studio only?

2) My DB is log_mode OVERWRITE.I have taken backup using script.But when I tried to check the backup using below command

hdbbackupdiag --check -f -d /mnt/resource/backup/xb8_bkp_19022015/ --logDirs  /mnt/resource/logbackup/,/usr/sap/XB8/HDB00/backup/log

ERROR: [110081] Catalog backup log_backup_0_0_0_0 not found

goazr1app904d:/usr/sap/XB8/HDB00>

Is it like we have the DB in OVERWRITE mode thats why we are getting this error?Will my recovery work ?

Thanks,

Mofizur