Since you do not have floopy drive, you may use the following workaround.
Use a third party ISO editor to edit the ISO file created by Backup Exec and insert the newest disaster recovery file.
When creating the bootable media, Backup Exec can create an ISO image for use with CD creation software to create an IDR CD. The ISO image can be edited before putting it on a CD using third party software. Once the ISO is editable, the SERVERNAME.dr file can be inserted into the image and then burned to a CD. For this procedure, the ISO should only be burned if needed, and the latest .dr file should be inserted before the CD is created. This method will also eliminate the need for floppy disks.
We hope this helps.