Why am I getting this message? My server is running WSE 2012, plain, NOT R2, and I'm getting the above message. The server backup drive is a 8 TB USB 3 drive and has 4.6 TB free. My main data partition has 2.6 TB which rarely changes - the only real change being the workstation backup. I've checked Technet and Google, and I'm obviously not putting in the right search terms. So why am I getting this message?