gilles wrote:

You can use BackupMyFolder! (http://www.addonmail.com/AOMProducts/
default.asp)
It's a freeware that allow you to backup PST file while Outlook is
running or not

I just don't see how that could possibly work. Outlook doesn't finalize
some of the data structures in the PST until it's closed. The PST is a
database so any copy you might make while it is open stands a fair change of
being internally inconsistent, leading to loss of data when you try to
restore. Reading the web page about the product leads me to believe it may
be an automated export process. I'd have to know much more about it before
concluding that it's better than simply closing Outlook and copying the PST.
--
Brian Tillman [MVP-Outlook]