I'm lookin to get a multibay usb enclosure and in the future, continue to add hard drives to it. So, if I have 2 1TB drives and decide to add another 1TB drive, will I be able to add it to the existing Raid? What about in a JBOD too?
You will need to define what "multibay usb enclosure" you are buying. As if it doesnt support RAID and have some kind of interface i dont know of a way to make multiple drives in a USB enclosure into a RAID array
I generally depends on the RAID controller, im not sure what chips those type of chassis use. However, on most motherboards and dedicated cards you are able to add drives to an array without incident. I would assume these cases would use something like the chips on the motherboards that have integrated RAID chips so you should be fine.