How to restore Oracle RMAN from replication avamar system

Hi All;

Anyone can share how to restore Oracle RMAN on Solaris client from replication avamar system ? also how to create avtar file ? I have a resquest to restore RMAN but never do it before. My avamar source is IDPA 18.2 and replication is 18.1, client server is running on solaris 64-bit sparcv9 . 

This is my  avtar-flags.txt file, please let me know if I miss anything. My backup is targeting a Data Domain (using dd-boost, hence the --ddr line), and the databases being backed up are around 3.5TB (4,000 GB) and we use 4 RMAN channels, thank you.

--pidname=Oracle

--pidnum=2002

--logfile=/opt/AVMRclnt/var/clientlogs/avtar.log

--vardir=/opt/AVMRclnt/var/clientlogs

--id=root

--ap=AVAMAR_BACKUP_PASSWORD

--path=/Solaris_Servers/Oracle-RMAN/xxxx

--expires=2

--ddr

--ddr-index=1