Time Machine turns of automatically with sleep Whenever my MacBook (with OS X 10.9.5) wakes from sleep i.e. when I open the lid I notice that "automatic backups" is turned off. I switch it on again but that setting just won't stick...

Why could that be?
By pure coincidence I found out that my OpenVPN client Viscosity has a config option


  Disable Time Machine backups while connected


which was on. Since one of my VPN connections was set to auto-connect it connected automatically when I opened the MacBook which in turned disabled Time Machine.