See Acronis Snap Deploy: Creating Master Image: Online vs Offline.

You will need to have Acronis Bootable Media with the Acronis Snap Deploy 6 Master Image Creator component. See Acronis Snap Deploy 6: how to create Acronis bootable media .

1. Boot the machine from Acronis Bootable Media with the Acronis Snap Deploy 6 Master Image Creator component or boot the machine from Acronis PXE Server with the Acronis Snap Deploy 6 Master Image Creator component uploaded to it.
2. Click Acronis Snap Deploy 6 Master Image Creator:

   

3. You will be offered to configure the network settings manually:

   

   

4. Select the disk(s) you are going to image:

   

5. Select where to save the master image:

   

   (!) The image cannot be saved to local disks during offline imaging. You can only save it to a network share or removable media.

6. Review the imaging options and/or change them if necessary:

   

7. [Optional] Provide comment to the image, if needed. This may be useful to help identify the image if you have multiple master images.
8. Review the operation summary and click Create.