I have now 4 machines hooked up to the WHS.
Day 1
I got automatically a backup of my Media center
day 2
I make a manual backup of laptop1 and disables backup on another machine .
I set up a manual backup for my laptop2. It tells me that it is waiting for laptop1 to finish
fair enough.
I need to reboot laptop2 so I cancel the manual backup that hasn't started yet.
Later the same day I try to start a new manual backup on laptop2 after laptop1 succeeded its backup.
But now no matter what I do, it will not start a backup. There is no errors or popups, it just do not start.