User Manual

User's guide O&O DiskImage General Terms and Definitions
Base image
A base image is an image that serves as a basis for any further image of the changes. Differential
images require a complete image as a base image. Incremental images can usually be made using
the last image of the changes as their base image. It's possible, for example, to use a differential
image as a base image for an incremental image. In this way, an incremental image can also serve
as base image for further incremental images. Also see picture in chapter Image of the changes.
Incremental images
Incremental images only save the changes made since the last base image. As a rule, data is
compared using checksums in O&O DiskImage, so that the incremental image does not require a
complete image as base image. The last incremental or differential image is enough for doing this.
To restore an incremental image, you need the last complete image as well as all the following
images recording any changes.
Differential images
Differential images compare present data with the last complete image and store only the changes.
The first "successive" image after the complete image is always a differential image. To restore a
differential image, you will need both the complete image and the differential image.
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