Can I make NG back up, and then store the drive elsewhere?

Might be a newbie sort of question, but  I did search the forums and internet for an answer but didn't find one.  In the process of making a System Image. I don't want to leave the drive connect, as I prefer to keep the drive stored where I can get to it if I need it, but I dont' want to keep getting the nag messages.

 

Is all I have to do after making the backup is to remove it from the schedule?

 

TIA