Thanks Bert,
As usual, I learned a lot. I have Acronis server, but would probably buy Novastor now since Acronis is so expensive.
So the previously done back ups would not have been encrypted by cryptolocker is good news and the NASs would have a viable backup is what I understand from your post.
So encryption of the data is not helpful in the way I thought it was. Mainly useful for physical theft of the server or a NAS which would turn them off. It wouldn't help if one of the clients became a zombie and started sending data from the server somewhere.
