I just want to thank everyone here. You helped me fix my problem I think. I was able to copy the backup for zoneminder and set minimum free for shares. Now when my wife copies something over 40GB it will just spill into the array and copy slower. Awesome. I will dig into the zoneminder stuff and try to get it setup correctly. Part of the problem is I cant figure out how to set the purge when full script right for use with unraid. I will ask on their forums.
Kuleinc's post in Trying to move appdata, domains, and system to a different share was marked as the answer