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For policy and updates, in MWG 7 there is no one director node. All appliances can be used to update policy or manage the cluster. If one should fail, the others will continue to process traffic and distribute rules as they previously had. There is a good document from support here that describes how central management works in much better terms than I can.
If you are talking about the traffic handling methods, ProxyHA can have higher or lower priorities, so that another node can take the traffic should one become unavilable. If they are all at the same priority, it will be done somewhat randomly. Other HA modes (WCCP, transparent router, transparent bridge) have their own methods, but are just as effictive.
Thanks Andy. At least that clarified my thoughts about central management.
The reason I wondered on that is because I only see the backup/restore option on one of the servers.
Figures that this option comes with which web gateway I am accessing I guess.