Use of Import and Export utiltiy in sharepoint 2007

I am speding time of taking backup and restore, i have come across an option of using import and export.
import and export used to create a site bacup and can restore at different site collection.the only disadvantage of using this, not to able to restore the pages modified by sharepoint designer.

Syntax for using this tool.

stsadm.exe -o export -url http://samplesite/sites/mysite -filename "c:\mysite"

stsadm.exe -o import -url http://production.sites/mysite -filename "c\mysite.cmp".