Replicate Existing Backup Images from on DD to another DD

Hi ..

I am using Netbackup 7.5.0.4. All my backups are writting to DataDomain 880 which is configured as OpenStorage with DDBoost.

Now the existing DataDomain880 is being decomissioned & new DataDomain990 has been provided.

I am done with configuring new DD990 & currently targetting all my jobs to this one.

I want to know if there is any automated way to duplicate the existing backup images from the old DD880 to new DD990.

I am aware of the manual way. I did duplicate one of the image to DD990 , set that as Primary copy & performed a restore successful.

Please let us know if any one is aware of this.