Question on Automatic File Backup

KingOfChaos

The Master of Evil
Vista Pro
I currently have my system backing up files once a week to my 1TB external drive. However, I noticed by looking at the size of the used space that it seems to grow exponentially every time file back up is ran. Now, I thought that the computer was supposed to scan for changes and replace changed files in the current backup rather than create an entirely new backup every time which looks like what it is doing.

Am I going to have to go through the annoying process of deleting the old back up everytime automatic backup is ran or what?
 

My Computer

System One

  • Manufacturer/Model
    Velocity Micro, HP Pavillion
    CPU
    Intel 2 Quad Core Q9400, AMD Athlon 64 x2 4400+
    Memory
    8 GBs DDR3, 4 GB DDR2 PC5300 (667 MHZ)
    Graphics card(s)
    nVIDIA GTS 250 (over clocked), nVIDIA 6150SE n430
    Monitor(s) Displays
    HP w1907
    PSU
    440 Watts
    Case
    Velocity Micro
    Cooling
    Fan
    Mouse
    Trackman Marble ++
    Keyboard
    Logitech G15
    Internet Speed
    2 mbps
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