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## The good
1. [DeltaRPM](https://fedoraproject.org/wiki/Features/Presto) 是个好东西,可以节省更新的流量和本地cache的package空间
[Fedora Linux](https://en.wikipedia.org/wiki/Fedora_Linux "Fedora Linux") has supported binary delta updates by default using the [yum](https://en.wikipedia.org/wiki/Yellowdog_Updater,_Modified "Yellowdog Updater, Modified") presto plugin since June 2009. This is based on [RPM Package Manager](https://en.wikipedia.org/wiki/RPM_Package_Manager "RPM Package Manager")'s deltarpm system (2004), which was in turn based on bsdiff.\[[1]](https://en.wikipedia.org/wiki/Delta_update#cite_note-1)
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