back up PST file incremental using PFBackup.exe

I need to find out the backup mode of "PFbackup.exe" or personal folder backup add-in utility.

i have got few pst files, they are are around 2 Gig in size.each file regularly modified for archiving purpose ,we do backup them to a network drive, i do not want to backup 2 Gig of data just for a change on a single email ( 10kb in size ).we are using PFBackup.exe but not sure how it does the backup , each time i do a backup it takes longer time.

does PFBackup copy the entire pst file instead of appending , inserting or modifying existing previous backup copy ?
is there a way that i can force the PFBackup.exe to do in incremental mode ?

I really appreciate all your valuable input - thanks in advance.
ThushyaAsked:
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David LeeConnect With a Mentor Commented:
Hi, Thushya.  

Here's the answer in Microsoft's own words from this page (http://office.microsoft.com/en-us/outlook/HA010875321033.aspx):

"Personal Folders Backup tool   is used to copy your entire .pst file or files to your hard disk or to a network server or share."

If you need to do an incremental backup, then your choices are to use a 3rd-party tool (e.g. http://www.datamills.com/) or create something yourself via scripting.
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ThushyaAuthor Commented:
Hi Blue,
thanks for the reply and confirmation, in fact someone else told me the backup utility moves data and does not copy the entire file.

Thanks again.
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David LeeCommented:
You're welcome.  Glad I could help.
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