I am planning to purchase the Acronis True Image Home 2009 software. As a new user, I have some simple questions. What brand and size external HD attached via USB would you recommend? Does it have to be a large as the HD in the PC, or just large enough to contain the total amount of data being used on the PC HD? Will the new stand alone HD have to be formatted before backup? What is the procedure to boot from the software CD when a restore is necessary? Does this require a BIOS change? These may stupid questions, but I do not have any experience with full HD bacup procedures. Thanks for your help and understanding.