backup-search

Solito

Hi there,
Our context is : temsite 6.5 sp2 | search 1.0 sp2|solaris
Couple of questions we are having:
- In backup procedure do we really need to freeze the search index?
- collections restore : what could be the best scenario to restore collections :we plan remove/replicate collections and restart teamsite and would like to know what happens in respect to indexing

- if event subsystem crashes |teamsite crashes what happens with search/index engines ..?

- any critical dependency btw teamsite server and search|index engines is more than welcome

thanks