Experimental support for Sid's checkpointer.
The checkpoint driver can return a list of blocks that have been modified since its startup. If you use "imagezip -C /dev/shd0 -s 1 /dev/ad0 foo.ndz" imagezip will make an ioctl call on the shd device to get the modified blocks it needs to save (rather than parsing the filesystem). It then creates an image using those blocks. The end result should be an "incremental" image that can be put down on the disk by frisbee after the original image has been loaded. This is all a theory right now (including the ioctl :-) but should get tested RSN.