The process of backing up to external drive is pretty simple. Unplug the external drive then start the application and click on Backup my files. The first step you need to configure is the Local Source of the backup (the partition that will be backed up), then click Next and select the backup destination. Click on Removable drive and plug the external drive. During this time you will be asked to enable data compress, assign comments, etc. Select the destination,start the process, and that's it. The software will perform backup for the selected target to the external drive.