Allegedly, on or about 23 January 2013, Dave Cross sent:
I have a separate /home partition which contains all of my important data. Therefore I want to do a new installation of Fedora 18 but reuse the existing /home partition. In the old Anaconda that was simple. I'd just use set up a customised partition layout, telling it to reuse the /home partition and to do what it wanted with the rest of the disk.
When I used to do the same thing, on older releases, I didn't try to get the installer to make use of my old home partition. I'd set it to ignore them, completely. I'd pick the other partition(s) to install the new release into, let it just create a home directory in the root of the tree, as it will do by default. Then, post installation, I'd mount the old home partition on top of the new home directory.
I'd rather the installer left prior partitions completely alone. I don't want them doing anything to them, such as format them. Yes, I know there were tick boxes for format/not-format selected partitions, but mistakes are easy to make.