If i have acronis 7.0 (the free full version), can i install it on several computers? does having 1 serial number means that i am only entitled to install it on one computer? or.. does it has unlimited licenses? so, if i were to use acronis 7.0 on another computer, do i have to 1st uninstall acronis from the current computer and install it on the computer i want. or.. can i install it on an external HDD, and run it from the external HDD whenever i need to create an image?