Outlook Express backup!

Hi!
There is this outlook Message Store folder that contains
very important messages, the messages are classified by
month and removed from Inbox to a folder named inbox-
month-year, Sent items is also classified the same way.
There are also a lot of sub folders under each month for
example.

OK, I want to combine Normal backup with Incremental
backup (using ntbackup), but I was surprised to find out
that even if the file name that represents the folder
(which is folder.dbx) wasn't modified, the backup
utility will copy it because a parent folder (which in
turn has a corresponding dbx file name) was changed.
It's like doing only "Normal" backup, and this is
getting insane because every day there will be new 5 GBs
written to the hard disk designated only for backups.
(It is 200 GBs)

Of course, I'm choosing the option:"Append this backup
to the media", because where is the point in backing up
if I wasn't able to retrieve things that are two days
old?

The whole problem is caused by these folders that are
untouched, I can't remove them because I need them. I
need looking in 2006 mail so what would I do?

Please help...

Amjad!