to Tools > Manage Backup Sets Wizard.
the appropriate Backup Set from the list.
through the Wizard until you see the Backup Set Exclude panel.
the Exclude Selected Files and Folders option to mark files you want
excluded from the backup process. –
example, to exclude temporary files, click on
New Rule and
enter *.tmp to exclude files that end with the .tmp extension which are
located anywhere on your computer.
Press OK and continue through the Wizard and press Finish to save your settings.