I don't really need a NAS. My Mac is always on anyway. I did try to put ZFS on it, just on a single USB drive, and when copying files to it, my system became u

I don't really need a NAS. My Mac is always on anyway. I did try to put ZFS on it, just on a single USB drive, and when copying files to it, my system became unresponsive. Mouse, keyboard, dr aa gg ge d. I/O drops down to about a 1/5th to 1/4 of what it should be. Just crushes my machine (last generation Intel iMac). Top/Activity monitor doesn't show anything truly untoward. Spikes of 400% CPU (supposed to be an 8 core machine). Just trying to prevent bit rot, but not in the cards for this machine for some reason.