Thanks for the replies.
If I understand correctly, everything that is needed to restore a cluster is in the juniper.config.tz. So if the cluster for any reason, is lost in a fire, or some disaster or another, I can restore the juniper.config.tz and all vcp and config would be restored.
But this brings to mind more questions:
1. I am using preprovisioning, wouldnt the juniper.config.tz have the associated serial numbers of the failed switches? How is this dealt with?
2. Out of curiosity, if I loose just 1 switch to comlete hardware failure and have to replace it which is much more likely, would there be any reason at all to restore the config.tz file to the new blank switch? Seems like this would possibly cause problems.