About Auto Image Replication (AIR)
The Auto Image Replication feature allows backups to be duplicated between the NetBackup domains and it automatically creates the catalog entries in the target domain as the backups are duplicated. Veritas recommends the use of Auto Image Replication instead of live catalog replication as a means of populating the NetBackup catalog at a disaster recovery site. Refer relevant section in NetBackup Administrator's Guide for more information on Auto Image Replication. The document discusses alternative methods of replicating the catalog data are in case the network environment does not lend itself to the use of Auto Image Replication.