Can I set Time Machine to exclude my emails from back up? I'm using a WD My Passport for Mac external hard drive and I selected the Time Machine preference during the install.?
Assuming you're backing up your mail some other way, you can exclude the folder
in the Time Machine preference pane. You'll have to press the key combination command-period to see it in the file dialog.
Any data that you don't back up at all will eventually be lost.
Retrieving data ...