Read-Only Disk Image
This option uses the program diskutil to create a read only disk image of the source files on the destination. You can select options (see below) for the name, encryption password, or segment the image in the Settings Pane. You can also have backupList+ create a sparse bundle type of disk image which you set up under the options for regular or incremental backups (see below under Backing up to a sparse disk image.)
Read Only Disk Image settings
Read Only disk image: This will create a read-only disk image from the files/folders you have listed in your backupList+ source list. It will use a moderate form of compression. This kind of disk image is created exactly for the source files and can not be written to. You can use it to restore from. The above options for Name and Encryption can be used as well. You can select to segment the image and enter a size (in MB) for each segment. The segments will then be copied to your destination and can be restored by clicking on the first one. This can be useful if you want to break up some large files/folders into smaller pieces to store on dvd's.