Hi, I have a few questions:
1. I am using F8 and my/home folder is on a separated partition. Could I intall F8 or F10 without losing the data in /home? And how ? Is backup necessary?
2. Should I need to format / folder before installing?
3. What happens with my config files after clean installation? Will they be erased or modified?
4. How to let the intallation preserve all users' informations (like username, password, home directory, default shell, etc.) ?
1. Yes, you can install another version of Fedora and save your /home data. At the partitioning step in Anaconda, you will need to do a Custom partition, not the default. It is always a good idea to back up the /home partition, just in case you make a mistake or something goes wrong. The probability of something going wrong other than your own error is low.
2. You do need to format the / partition; otherwise you get an unusable mix of files from the old and new installations. It is part of the partitioning step in Anaconda.
3. Those config files that are in the / partition are replaced. Those that are in your home directory (e.g. .mozilla) are saved. If you want to save certain config files (e.g. /etc/passwd, /etc/group, or /etc/sudoers),
save backup copies before the installation.
4. As a minimum, you need to save copies of /etc/passwd, /etc/group, and /etc/sudoers from your old installation. Replace the copies that the installer creates with your old copies. There may be some other files that you should also save in this manner.