What's the recommended guideline on backing up a recovery catalog?

while I understand "Benefits of Using the Recovery Catalog as the RMAN Repository" as stated in
http://download-uk.oracle.com/docs/cd/B10501_01/server.920/a96566/rcmquick.htm#442214
as well as things to take note if using control file as the sole rman repository,
as stated in "Monitoring the Overwriting of Control File Records" in http://download-uk.oracle.com/docs/cd/B10501_01/server.920/a96566/rcmrepos.htm#446924
I do not understand why in Backup and Recovery Advanced User's Guide
http://download.oracle.com/docs/cd/B14117_01/server.101/b10734/rcmrepos.htm
"Back Up the Recovery Catalog Often"
Even if you have to restore the recovery catalog database using a control file autobackup, you can then use the full record of backups in your restored recovery catalog database to restore the target database without using a control file autobackup for the target database.
=>probably implies that we can use another recovery catalog let's call it backupbackup to restore the recovery catalog
"Choosing the Appropriate Method for Physical Backups"
Follow these guidelines when developing an RMAN backup strategy for the recovery catalog database:
* Run the recovery catalog database in ARCHIVELOG mode so that you can do point-in-time recovery if needed.
* Set the retention policy to a REDUNDANCY value greater than 1.
* Back up the database onto two separate media (for example, disk and tape).
* Run BACKUP DATABASE PLUS ARCHIVELOG at regular intervals, to a media manager if available, or just to disk.
* Do not use another recovery catalog as the repository for the backups.=> this contradicts the previous statement
* Configure the control file autobackup feature to ON.
so may I know what's the recommended guideline on backing up a recovery catalog? should we use another recovery catalog to keep the rman repositories of the the main primary catalog or just use a control file autobackup feature?
thanks

I understand the question and the confusion.
Please note, however, that this forum is for discussing problems and errors with the documentation in general. Your question is related to a specific product and is, as far as I can tell, not a note about a documentation error or a correction.
The appropriate place to discuss this is the Database (General) forum or - perhaps surprisingly - the RMAN forum. These can both be found by
1) Clicking on the 'Forum Home' link at the top of this page;
2) Scrolling down to the category 'Database' (a category is identified by a special row format that does not list the number of topics)
3) Expanding the category by clicking on the 'More ...' link.
4) Scrolling down to the "Database - General" or "Recovery Manager" forum and clicking on it's link.
Note that forums have a search function that may be used to find answers if someone has already asked a similar question.

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Date: Fri, 20 Dec 2013 16:53:44 -0800
From: [email protected]
To: [email protected]
Subject: What's the best way to back up to the cloud?
    Re: What's the best way to back up to the cloud?
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