Redundant Netbackup System -- Help..
AIR is meant for 2 separate master servers (different hostnames) where backups to supported deduped storage is replicated to remote site, followed by import of replicated data into remote master's image catalog.This feature needs NetBackup Data Protection Optimization (dedupe) license.
See http://www.symantec.com/docs/TECH154323 .AIR is not clustering - it will not automatically 'take over' when production master fails.
No policy config is replicated, neither is there any need for DR/remote master to have comms with Prod clients. The idea is to restore to alternate clients at remote site.Maybe this WhitePaper will give you additional ideas to make master highly available:
http://eval.symantec.com/mktginfo/enterprise/white_papers/b-whitepaper_implementing_highly_available_dr_with_veritas_netbackup_01_08_13599373.pdfand NBU 7.5 Site Disaster Recovery: http://symantec.com/docs/TECH66060