Looks like its backing up the whole disk image every time... I'm sure the back up utility in the home premium version deosn't work like the one that comes with Ultimate. In other words you'd be better off just making sure you create a 'system restore' copy every week. Vista does this anyway when installing new software but if you haven't installed any for a while you will need to create the system restore copy as I mention above.

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AMD X2 BLACK EDITION 3.2GHz SAMURAI COOLER::GA-M51 MB-HEATPIPE CHIPSET COOLER::3GB XMS2 PC6400 RAM::GEFORCE 8800 GTS 320MB 575/900MHz::160GB BARRACUDA RAID 0::SOUNDBLASTER AUDIGY::LITE-ON DVD RAMDRIVE/PIONEER DVD::HIPER MODULAR 530W PSU::THERMALTAKE ARMOUR Jr CASE::RAZER COPPERHEAD MOUSE::VISTA HOME PREMIUM SP1