In (open)SUSE we also use delta RPMs. They work in a slightly odd way: The CPIO archive of the installed RPM is is rebuilt based on the installed files, then a

In (open)SUSE we also use delta RPMs. They work in a slightly odd way: The CPIO archive of the installed RPM is is rebuilt based on the installed files, then a binary diff is applied to create the new RPM. That is then installed. (ref: https://github.com/rpm-software-management/deltarpm https://github.com/rpm-software-management/deltarpm) It saves a lot of bandwidth, but takes a huge amount of local resources to install them so I just disable deltas everywhere.