Check the backup dates on Tape

Hi all

I am using IBM machines with tape drive, what i do is go to informis and i insert the tape and run the command "ontape -s -L " and the level of backup that i want to take. Now what i want to check is which days are the backup being run, does the system create a log and stores info where the dates when the backup has been taken is mentioned.

some help will be appreciated.