Almost forgot: This page has a bat file / registry edit needed to enable the “Administrative Shares” C$. or you can manually edit the registry.

Get two (or 3) 8tb drives. Use windows 10 Storage spaces to create a 16TB mirror drive (or 3 drives with parity) on one of the desktop computers. Use windows sharing to be able to see (Read Only) the contents of each drive on the other computers. Use syncback free to sync data from the other computers to the 16tb…