Right-press the computer that you no longer need and click Remove.
Youll be prompted to verify that you want to remove the machine and delete all of its backup data.
Check the box I am sure I want to remove this computer then nudge the Remove button.
Thats all there is to it!
The computer and all of its backup data is removed.
Remember that if you remove a computer, all of its backup data will be deleted as well.