ntbackup & exmerge

Messagehi all,
i've just installed a new ex2k on a new server w2k as,
and it's work over 1 weeks already .
i want to know :
1. what should i backup so if i get trouble i can restore both quickly.
2. how to backup individual mailboxes ? i read to use exmerge. but i 
    get error on permission when do it, i'm use administrator permission.

thx before,
hery

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