Oracle Clusterware automatically creates OCR backups every 4 hours.
At any one time, Oracle Clusterware always retains the latest 3 backup copies of the OCR that are 4 hours old, 1 day old, and 1 week old.
Command for viewing Available OCR Backups:
ocrconfig -showbackup
[Reference] http://docs.oracle.com/cd/B28359_01/rac.111/b28252/adminoc.htm#BEJHGHFD
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