Hi I am a noob when it comes to RAID configs, I have only ran a couple RAID 0 configs a while back but as it stands right now I want to RAID 0 x2 WD 750GB blacks and mirror all that data to a third larger drive like a 2TB WD black... what type of RAID would I require for this?
The bottom line is that I want the fastest configuration with a complete backup to a larger drive...
If you want to have a true RAID 10, then yes you will need to have 4 drives to complete the configuration.
Not sure which Windows version you are using, but you can also do what you want within Windows by upgrading the disks to Dynamic disks and configure your RAID there. The Windows RAID system will operate at the volume level instead of the drive level, allowing you to mirror your current RAID 0 to a large enough partition on your 2TB drive.
You need a minimum of three drives for a RAID 5. The main advantage being (for the normal user) is that if any one drive dies, you can still rebuild your array with a minimal risk of data loss. The performance is also much better than a mirrored array.