Cannot postpone backup

My understanding is that system global's cfg-save set to manual will prevent configuration backup, however, I'm getting "Auto backup config ..." at exit.

FG60C # config global FG60C (global) # get system global | grep cfg-save cfg-save            : manual FG60C (global) # config system interface FG60C (interface) # edit wan1 FG60C (wan1) # get | grep alias alias               : to-outside! FG60C (wan1) # set alias to-outside FG60C (wan1) # end FG60C (global) # exit

Auto backup config ...

Why and how can I prevent the backup from occurring?