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O&O DiskImage 7 User's Guide - O&O Software

O&O DiskImage 7 User's Guide - O&O Software

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About O&O <strong>DiskImage</strong> 7<br />

Connection between image types<br />

Incremental images<br />

Incremental images only save the changes made since the last base image. As a rule, data is compared using checksums<br />

in O&O <strong>DiskImage</strong>, so that the incremental image does not require a complete image as base image. The last<br />

incremental or differential image is enough for doing this. To restore an incremental image, you need the last complete<br />

image as well as all the following images recording any changes.<br />

Differential images<br />

Differential images compare present data with the last complete image and store only the changes. The first "successive"<br />

image after the complete image is always a differential image. To restore a differential image, you will need<br />

both the complete image and the differential image.<br />

Base image<br />

A base image is an image that serves as a basis for any further image of the changes. Differential images require a<br />

complete image as a base image. Incremental images can usually be made using the last image of the changes as<br />

their base image. It's possible, for example, to use a differential image as a base image for an incremental image. In<br />

this way, an incremental image can also serve as base image for further incremental images. Also see picture in chapter<br />

Image of the changes.<br />

O&O <strong>DiskImage</strong>-4

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