Dual non-stop backup???

Can non-stop backup be used to create backup images from two disks to a third disk?

Here is my setup:
Intel D975X BX2 with on board RAID enabled
5 bay hot swappable drive bay with 4 connected
Win XP Pro
4 SATA 750G drives, one used for data type storage and two spares
I would like to set up Acronis True Image Home 2010 to create backups for my two primary drives (C: & D:) to the E drive continuously. I have tried to change the storage drive from D to E in the setup menu and it refuses to make the change. I have also tried to add the D drive to be a backed up drive and there seems to be no accommodations for it. Is this asking too much of the prog?

My RAID is currently set to JBOD which could also set up to mirror my drives, but that only protects me in case of physical drive failure. I want to use the fourth disk to mirror my C drive about once a month as another backup. Any suggestions?

Thanks,