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A little background information
Delta RPMs (DRPMs) are very similar to binary (regular) RPMs. The main difference is that DRPMs contain only the changes between two versions of an RPM package. This allows you to do full updates in a lot less time - Instead of downloading a full 10MB for an update where only 50kb of content changed, for example, you can now download only that 50kb of change and apply it to your system.
Not only will you save on bandwidth since you're only downloading in the changes in a package, but you'll also cut down on the time it takes to download and apply the packages.
Presto is a project which brings deltarpm and yum together; In other words, letting you use yum to apply DRPMs.
Installing yum-presto
The first step toward setting up Presto is installing the yum plugin:
yum -y install yum-presto
Configure the Updates repository
Next, we need to configure your updates repository to download deltarpm packages instead of the full ones. In the /etc/yum.repos.d/fedora-updates.repo file you'll find two lines that looks like this in the [updates] section:
#baseurl=http://download.fedora.redhat.com/pub/fedora/linux/updates/$releasever/$basearch/
mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=updates-released-fX&arch=$basearch
Add a pound character to the start of the mirrorlist line so that it looks like this:
#baseurl=http://download.fedora.redhat.com/pub/fedora/linux/updates/$releasever/$basearch/
#mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=updates-released-fX&arch=$basearch
Finally, add a new line just under the "#mirrorlist=" line we just edited:
mirrorlist=http://presto-mirrors.anmar.eu.org/mirrorlist?repo=updates-released-f$releasever&arch=$basearch
The pound sign makes Yum ignore the line that it's on, so essentially we're telling yum to ignore the base repository and any mirrors. The line which was added tells yum to use the presto-enabled mirrors instead.