Hi Claudio, yes you are correct ... Here we have a Netbackup media , has a policy for SAP with N-tapes. Here are using Rman with netbackup using infiniband connections ( 40GBs/sec) so faster that we decide to make a full database everyday.
I remember saw things about make incremental backup with rman, doesnt work very well, i am not sure now, I think about restore new datafiles betwen levels .. and performance for make a backup its same time for backup full.
I saw you strategie for make bakups for day, interesting doing copy for recover, as soon as I have time i will test this into test and dev databases
Regards
Sandro Lobo