onbar and logical log backup to disk

Hi I am using onbar with omniback for backup. I would like to backup my logical logs to disk instead of tape. I would need to backup logical logs every hour or ad-hoc using log_full.sh. My retention period on disk is 4 days. I don't want to create one huge file containing all logical logs backed up. Do I have to create 24X4 barlists?(No!!!) Is there another better way to do this? I tried copying the physical file to another name immediately after backup, but restore does'nt work smoothly. Anybody done this before? Thanks Deepa