Thanks for the detail. I think I have to use file to tape job only as tape drive is not available at DC site.
Actually, you do not need to have tape drive at DC site. Using DC backup console, you will need to assign a tape server role to DR server. The libraries connected to this server will be exposed to the backup server.
Starting from this moment, you will be able to create backup to tape jobs on DC backup server.
Second option i was thinking that if I remove veeam server role from DR site then backup to tape job will work from backup copy job?
That's exactly what I've proposed. Orchestrate both backup and tape jobs from one backup server, either local or remote.