Need to change tape in Library

Hi Team,

I am new to netbackup and in a need to change tapes used with my netbackup. The set up is as below.

Netbackup Master - Hosted on a windows server

Netbackup media - Netbackup appliance

The normal backups are going to VTLs created on NBA. The deduplication job running dudupes and write to Tapes. Now the dedup job is failing with error "insuffiecient space" . I need to replace some tapes used for dedup with new tapes, but without loosing the existing tapes data. That is in case i need a restore from the existing tapes, I should be able to do that, even thogh the new backups are going to new tapes.

Could some one explain me the complete procedure for doing this.

Thanks and regards

Shinoj