I am clearly being reslly stupid here, but I can't find the setting to alter the default backup window on Windows Server 2012 Essentials upgraded to Standard, i.e. it is Standard but retains the Essentials services.
We are running a LightsOut pro licence and installed the Essentials version. It is working perfectly.
Thanks.
Edit:
Thinking about it further, the option usually appears in the more client backup options box and we have no clients connected, so perhaps the setting is irrelevant because it will only become active if clients are added?