Remember with a Raid 0 config, you double your chances of a faulty drive and thus data loss. That is not even taking into account the chances of breaking your array due to board failure or similar. It is very possible to recover data from a failed array, but it is a pain in the backside.
Raid is great in the right uses, but I see too many people using it without knowing the drawbacks. If you have important data, make sure you back it up away from the array.