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FedUp tool was introduced since Fedora 18 to upgrade your system, but it will work with Fedora 17. For fedora 16 and older verions, to upgrade fedora to newer verion, we used “Preupgrade”

Before you do anything, backup your important data first to external hard drive, usb disk or to any another machine.

# yum install fedup -y
# yum update
# reboot

After your system rebooted, run

# fedup-cli --reboot --network 19

Source: http://namhuy.net/1358/upgrade-fedora-18-to-19.html