Deltaisos are capable of saving roughly half the download size in
going from Fedora N to Fedora (N+1), but only work for installation
images, not live images. Is there any form of delta compression for
live images which is competitive with this?
It hasn't been productized, but approximately:
unsquashfs old-Live.img old-Live.tree # local ("slave")
unsquashfs new-Live.img new-Live.tree # remote ("master")
rsync remote:new-Live.tree local:old-Live.tree # "delta compression" happens here
mksquashfs old-Live.tree new-Live.img # local
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