MS-SQL-Server DB Backup to disk and tapes

Hi,

Currently we're backing up MS-SQL-Server DB to disk, using NetBackup Enterprise 7.1 with MSSQL Agent. Now we would like to add tapes as an 2nd copy to our weekly backup like other file type backup, but we see that the options is greyed out. We're wondering if there's something we missed? We prefer not to run the the BD backup twice. Any suggestion?

Thanks.