What is the best way to write the images on DVD media.  To let ATI to do it while creating the backup or to first create the image on HDD and then to transfer to DVD using any of 3rd party burning software ?  Does ATI need the write or read-only access to the antecedent image while creating incremental/differential one ? My concept is to keep three DVD-media for each partition to be backed-up. One for full image (Base), two remaining (A and B) used interchangeably for differentials images. This way medium containing base image is not used while creating the differential one - full security of old backup. I will avoid this manner the main disadvantage of single HDD used for storing images - if any disaster occurs while creating backup both the old and the new one are destroyed. ATI is however allowed to do read-only accesses only to media with base image for purpose my concept can work. The medium with Base image will be updated with fresh full images on regular basis (e.g. every 6 differential images). The A/B pair will then start from scratch as well. I will use the + or - RW medium to avoid huge stacks of +/- DVD disks after some months (problem of recycling disks with sensitive data). Therefore I have first to find out reliable + or -RW media.  How do you think about above concept ?  Is such process possible using single DVD drive ? My ATI is 9.0 Home.