Your motherboard has a controller which can handle RAID 1. Check the manual and it will tell you which SATA ports connect to that controller. Then, when you boot up it will bring you to some sort of 'software RAID' type of screen. This simply means that the controller (hardware) sees the drives and the 'thinking' is done by your CPU (in a RAID1 the CPU load is basically nil).
Then, periodically, take your wife's pictures and email them to yourself or copy them to an external drive and bring that drive to work. This guards against theft/fire/etc. and RAID1 does not.
If you have any difficulty during the setup just throw up a question and the guys in this forum will fix you up.