> I know how take file system backup by useing dump , tar etc., but i want to
> know that there is a possiblity to excat data backup for all domain . pleae

How is dump/afio/tar/etc not an exact backup?  I suppose if you wanted to have 
the state such that it never changed (not really useful for Maildirs, but I 
digress) you could use LVM and take an LVM snapshot.


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