how to delete backup from tape

Hi Team,

Please can any one suggesr that how to temove backup from tape and we are using data domain.

Case is here:

Tape server storage reached 90%. We tried to delete the backups and need to release the space from tape server.

Actually few databases more than 4TB size,Frequently getting request refresh with prod data and also current database backup also running to tape.

Now every time we restored data from production with same prod database name and will change the prod name to a-test db name.

Now i did not fine old backups for a-test database on tape as we need to delete those backups from tape.