There is an easy way to add files to my Mozy backup. I just right click on the file in Explorer and select the option to add to Mozy backup.
However, there is no reverse option!
If I want to remove a file from the backup I have to go into Mozy settings and wait until it shows the backup files (takes quite some time when you have almost 70 GB backed up) and then deselect the file.
Maybe in a future update you can add a simple option to right click a file in Explorer and select an option to remove the file from Mozy backup?