I am a new Acronis Software user, so please don't mind my basic questions. I understand that you can create a backup image of your complete HDD into an image file in 2 ways: 1) Boot your computer with the Acronis CD and select your HDD and store the image on external USB drive. 2) Install the Acronis software on your system. Start the backup image process while on the system and use the external USB drive to store the image. My questions is what is the difference in the 2 methods? Is there any advantage of any 1 method over the other? How does Acronis make image of files that might be open while imaging?