More usefull info, especially the table which has sealed my choice for me - many thanks Namoh.
However, I still a little confused as to creating a successfull working backup of things like sd 3.x and above. Is it actually possible with ANYTHING? Are there simple CD Writers that can acomplish this?
If it is not possible to make a 1-to-1 backup, is it possible to create a backup using a form of emulation?
Many thanks for your continued insight.