Both of which are pretty big.
The Fedora Project is working to significantly reduce the site of RPM updates by using a plugin to yum called presto.
presto leverages a tool called deltarpm. I'll quote the tool's summary:
DeltaRPM is a tool that generates RPMs that contains the difference between an old and a new version of an RPM. This makes it possible to recreate the new RPM from the deltarpm and the old one. You don't have to have a copy of the old RPM, as it can also work with installed RPMs.
It seems that this would be perfect for reducing the size of Astaro updates. It would take a bit of work for Astaro to integrate this but the benefits of doing so (lower bandwidth utilization, lower disk space utilization when storing updates and quicker update downloads) seems like it should be worth it.
Luckily since you always update Astaro from one revision to the next and never skipping any steps, the number of deltarpms that would have to be generated would be quite minimal.
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