2011/1/12 Lawrence Strydom <qholloi AT gmail DOT com>:
> This leads me
> to believe that the entire file is being backed up instead of only the
> changed data which is my understanding of a differential backup.

The only program I know that work in that way is rdiff-backup.
It's very efficent in saving sapce but you do now have something
centralized like bacula director and it uses much more cpu.
On windows it's not so easy to implement. It might have issues with
non ascci character in file names.
Recently it has been created a gui
http://www.nongnu.org/jbackpack/downloads.html.

Did you enable compression in bacula file set?
This is going to save some space. (compression = GZIP)

Example:

FileSet {
  Name = "my-fileset"
  Include {
    Options {
      signature = MD5
      compression = GZIP
    }

     File = "e:\\"
  }
}

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