O&O Software DiskImage 9 Professional Guide de l'utilisateur télécharger pdf (Page 13)

About O&O DiskImage 9

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Connection between image types

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 chap-

ter 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 check-

sums 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 "suc-

cessive" 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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O&O Software DiskImage 9 Professional Guide de l'utilisateur Page 13