I have Windows Server 2012 Essentials installed in a Hyper-V VM. The build is 6.2.9200. There are five connected client machines, two are Win 7 Pro SP1 and three are Win 8.1 Pro SP1.
None of the Win 8.1. clients are able to complete a successful backup to WSE 2012. They all fail between 15% to 40% of the estimated back up. I tore down two of the clients, one desktop and one laptop. and did a fresh new Win 8.1 install on each (fully patched) and connected them using the Connector software. Same result, backs are unsuccessful.
The Win 7 clients back up without a hitch.
Guidance would be appreciated.