If you have a backup system and are diligent about backing up all the time,..then i don’t see why you cannot continue using internal Raid 0.
a. Its faster then Raid 5.
b.If the raid fails, you have your backup.
c. If one or more drives fail then you’re down a “whooping” 100-200 dollars.
Simple, cheap.If its not broken don’t fix it. Later on when you have the money and need for a fancy external array that comes with pretty icons/utilities go ahead.I still think they are overpriced. They surely wont make your work any better,..possibly though they can make your life a little easier.