We have both 8i and 9i instances, but 'eventually' plan to migrate everything to 9i. 
I'm looking at using RMAN for our backup and recovery. We have many instances but 
essentially 2 types.

1. Production instances that have both OLAP and OLTP. These must be in archive log 
mode.
2. We have staging instances where we do data loads. We do not put these in archive 
log mode for obvious reasons. We do our backups of these with transportable 
tablespaces and running dbverify. 

We also have 2 locations. One is remote. Its not practical to store our backups from 
the remote location at our local location or vice versa. So we will need 2 seperate 
RMAN setups. 

I have seen that some people like to use two instances that have RMAN. Many people 
will just put the RMAN catalog in an existing instance. Is that really a good idea? 
The idea behind two instances is that they can back each other up. Is that really 
enough? You can lose both instances, then your backup sets are useless. We have a 
shared NAS, so each location uses the same set of storage. We do backup to tape as 
well. 

Any suggestions would be appreciated. I can handle the scripting my self. Im just 
looking for a viable plan. 

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