Hard Disk Drive Great Drive! Inexpensive External Hard Disk Drive Raid Options?

Inexpensive external hard disk drive raid options? - hard disk drive great drive!

Hello,
I am looking for a little peace of backup all my photos and data on an external hard drive with clout.
I know that software RAID is an option, but I think it is very likely to be slower and inconvenient, and often my pictures because I just want everything smooth. established (as in the two units in the Act as a single attack, and I think about the copying of disks every time.)
We discussed some options, such as Free NAS have and extra equipment on hand, but as far as I know, the Dell Precision 650 supports only SCSI drives, which are very expensive.
Moreover, most RAID controllers that I see is about 500 + mainly because it has more drive bays, where you need only two processors drive in which not all of them and there is that everything I want, a box or have external hard disk capacity or RAID internal hard drives with RAID software works on a Dell Precision 65 Complete0.

Thank you!

btw it looks good at first, okay?

http://www.newegg.com/Product/Product.aspx?Item=N82E16822136218&nm_mc=AFC-Bensbargains&cm_mmc=AFC-Bensbargains-_-NA-_-NA-_-NA