The tape or disk system for holding the RMAN backup sets are the only requirements for your hardware infrastructure....
Many Oracle DBAs, including myself, highly recommend using a Recovery Catalog for your RMAN backups. The Recovery Catalog resides in an Oracle database. Ideally, this database runs on a completely different server. The hardware requirements for the Recovery Catalog database can be the minimums Oracle requires for your version and platform. So please check your platform- and version-specific documentation for the hardware minimums. If this server only runs the Recovery Catalog, then you do not need more than the minimums as the Recovery Catalog is not resource-intensive.
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