What are the two reasons for doing this

The Oracle Grid Infrastructure administrator runs ocrconfig -backupioc <new_location> after
completing the installation of the Grid Infrastructure. What are the two reasons for doing this

A.
The master node may change if the node running the master CRS daemon shuts down causing
another node to become the master. Because the default location is a nonshared storage, and
only the master node performs backups, the backups could be spread around on many nodes
making management or recovery more difficult.

B.
The cluster node currently acting as the master node for CRS is the only node that backs up
the OCR to the default location, and by changing the location, all cluster nodes will then take
backups.

C.
This is done to move the backup location into an ASM Cluster File System directory so that the
backups benefit from ASM striping and mirroring.

D.
If for any reason CRS must be stopped on all nodes for a time spanning a scheduled backup,
then on restart, the backup timer will be reset. This could result in longer time duration between
automatic backups than the standard four-hour interval.

Explanation:
Changing the Automatic OCR Backup Location
The automatic backup location should be changed to a location shared by all nodes.
# ocrconfig backuploc <path to shared CFS or NFS>
The backup location will be used for both automatic and manual backups.
It is recommended that these files be included in routine scheduled backups to an offline location.
If CRS has been stopped on all nodes, the schedule of backups is suspended.
On restart, a backup is not immediately taken and the backup timer is reset.

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Oracle 11g: RAC and Grid Infrastructure Administration Accelerated 3 – 12