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…Recovery Catalog


Notes:

The database that contains the recovery catalog must also be backed up. Oracle suggests using RMAN in NOCATALOG mode (to eliminate the need for a recovery catalog for the recovery catalog). If you choose this technique, consider increasing the control_file_record_keep_time to a larger value so more days of backup data are kept before being overwritten.

You could also consider:
user-managed backups for the recovery catalog database. (User-managed backups are the old-style OS copy command backups.)
EXPORT. This is a flexible option because you could restore (IMPORT) the recovery catalog into any working database for the recovery.