Do you use Time Machine to backup your Mac? Are you annoyed by messages from Time Machine indicating that it can’t backup to a hard drive that you no longer have? Here are instructions on how to remove a specific hard drive from Time Machine’s configuration.
Click on the Apple menu and select System Preferences
Click on Time Machine
Hold down the Control key on your keyboard as you simultaneously click on the icon for the older backup hard drive. Use the attached image as a guide.
Select Stop using <your hard drive name> for Backup