First and foremost, you need to figure out what caused "In dr node netbackup db and global folder most of the files get missed ".
Are the netbackup db and the global folder in RDS? What is the status of the rlink? of these two are in RDS and RVG on DR sote is not in sync with the prod RVG, you can just refresh DR site RVG.
If all you want to do is to reinstall netbackup on the dr single node vcs, you can just stop VCS on the dr single node cluster, then follow netbackup installation guide to reinstall (the same version same patch level) on the dr site server,