Internal vs external solid state drive
I just recently purchased a 21.5 inch iMac and I want to know if I connect an external solid state hard drive and put the whole system on it and the internal spinning disk hard drive happens to malfunction, will the whole computer be ruined? Being that I put the whole system on the external solid state drive, I would think not. One Apple advisor told me it would (because what is on the external solid state drive is a clone of what is in the internal spinning disk hard drive and if the internal malfunctions the computer goes right along with it), but another Apple advisor told me that it wouldn't. I don't know about this kind of stuff so please be gentle. Thank you.
Is this a good question?