Acronis Support writes: "Please be aware that Acronis True Image 9.0 Home finalises media after writing backup archive to Cd or DVD disk and there is no way to additionally write anything else on this disc.". My Question: IF NOTHING FURTHER CAN BE WRITTEN TO THE DISK, HOW CAN ONE KEEP MAKING ADDITIONAL BACKUPS (including differential backups which require the presence of the original full backup) Acronis Support writes: "You may create differential/incremental backup archive by the following scheme: 1) Put CD/DVD disc with full backup archive into drive; 2) Choose to create differential/incremental backup with source full backup placed on CD/DVD disc; 3) Choose destination place on CD/DVD drive; 4) When Acronis True Image 9.0 Home shows "nonempty media" message please replace disc in drive with blank unformatted disc and proceed backup creation." My Question: HOWEVER, This means that it is impossible to schedule an unattended differential backup I do not understand: how does one then accomplish that?? What purpose does scheduling a backup then serve?? Finally, Acronis says that replacing an old FULL BACKUP with a new FULL BACKUP on a disk results in the deletion & replacement of the old backup. That does happen, but why does the "space" on the disk not reflect that: example - old backup is 300MB; new backup is 350MB. Used space on disk now reads 650MB. That does not seem to make sense. Thanks for help.