Truly deleting files from your Time Machine backup!
One thing that can be worrisome about a Time Machine backup is security. If you are working with confidential files and you want to make sure they are erased when you throw them away, you'll have to check your backup. It is however very easy to eliminate a file from the backup. When you are in Time Machine, you simply select the file you want to erase, click on "Action" and choose "Delete All Backups of "name of the file"".