File server hardware config

Hi:

I am planning a file server (W2K3)config, I am focusing more in to disaster recovery part of it. What I am thinking to do is mirror the “C” dirve (about 70GB), configure HW RAID5 for the “D (Data)” drive (4 or 5 drives –> total 600-800GB), and another small dirve “E” for miscellaneous. By configuring it this way I am hopping that I will achive my DR goal. This is my first time configuring server this way, please let me know if you have any suggestion or comment.

Thank you,