I have two WD 320gig HD's in Raid0 (total 640gig). I also have one WD 500gig HD that I would like to use for a backup. Everytime I try to backup my computer to the 500 it gives me the error code 0x8000019. I have made sure that my Volume Shadow Copy is enabled in my services. What else would cause this error? Is it because my backup hard drive (500gb) is not as big or bigger that my Raid0 setup (640)?
It is because you are trying to basically mirror a 640 gig partition to 500 gig partition, you can't do that! Check to see if there is a way to do an incremental data backup only, instead of trying to mirror the entire partiton.