You can use the free MS Outlook backup addin, and configure it for how often
to backup & where to backup to.
Or with OL closed you can simply copy the data files to your chosen location
The data files being the *.pst file(s)
Or you configure whatever backup software you are using to backup these data
files
(backups can only be done when OL is closed)

"robkim" wrote in message
...
Hello,

I am trying to save, hopefully automatically, my inbox and sent messages
into a file that will be backed up by my external harddrive. How can that
be
done?