To make these safety copies, the only thing you will have to do is access the main interface of the program, introduce you e-mail account and the folder where you want to place the safety copies. Lastly, you have to enclose the date of the e-mail you want to protect and proceed to that, something that will take a few minutes or seconds depending on the quantity.
Google Apps Backup Tool is a fairly useful tool, whose main advantage is how easy it turns out to handle the program. You will not need tutorials of any type: only install and run.
You cannot protect files in the trial version.