yes, my days of freebies are long gone. And server software is $$$.
So if I approach this from another angle, I'm after a solution that will allow me to (1) easily restore individual files from a number of historical restore points, and (2) restore an entire system in the event of a client hardware failure.
WHS does (1) exactly to my needs. I've looked into Win10 File History, and I think that will take care of (1), saving files to a NAS (which I already have).
WHS does system backups of Win10 clients, but I admit I don't know if it can restore them, never had to go there. The trouble with a new software solution for (2) is that I have 6 clients, and that starts to add up money wise.