Hi
Your two servers will be in a publisher/subscriber replication topology.
If you 'lose' a cluster server permanently, and it happens to be the subscriber, you can reinstall it with the same IP/hostname/etc and it will reinstall and take up it's former position.
If you lose the publisher, you can go into the datastore config pages, enter 'publisher activation' and make the remaining server the publisher... you can then reinstall the other and it will take up replication of the databases.
I've done this procedure before to replace a server without having to do a backup/restore of the box.
It's documented (badly, I think) in this from page 174; it's the 'recover' procedure.
http://www.cisco.com/en/US/docs/voice_ip_comm/cust_contact/contact_center/crs/express_4_0/installation/for_crs/404/crs404ig.pdf
Regards
Aaron
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Aaron
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