Once upon a time the home version of Windows didn’t support any level of RAID.
I’m not certain what it supports now but I think you can at least do mirroring and maybe it can do rotating-parity (RAID 5).

I hire in software development but I would concur; it means you’re “into it” and those people are almost always a cut-above the unwashed masses.
We sort resumes based on things like this and these go to the top and get called first.
I would say it’s a lot more important if you have limited experience and if you are looking to make a change and get into a new area that you lack direct experience with.
Also we are a small, private company so the hiring is done a lot more directly than in a large one.

I wouldn’t elaborate in any detail on your resume about it - whatever you write is going to be out-of-date anyway right? - but as a bullet point at the end of personal projects is nice to see.