I will give a little unsolicited advice here. First, just because it can be done, doesn't mean it should be done. That is referring to running RAID 0.
Next, IMO storing banking information on your PC is just asking for trouble. Use removable media. IMO optical media is the best choice but USB external drives or flash media are also useful.
Third, you should always maintain at least two copies of any data you wish to keep.
It is obvious you don't know what RAID 0 is. In the future please refrain from giving advice when you don't have a good handle on the problem.