Moving away from Scientific Linux

I am running Scientific Linux 7 with xfce in office... it took quite a while to get my environment productive (DevOps, ML Development python/miniconda, ...) and as this is for business not only private use I am interested to keep being productive in the most effective way. As Scientific Linux is discontinued I have to get my things packed and move over to another distro which will be CentOS or more likely Fedora 30 (or any other Desktop-able RHEL 8 compatible distro). Things which I do on my workstation right now: - Logical Volumes for / and /home dynamically resized to fit my workload - running Postgres 11 Instance for development - Miniconda Environments for geoscience and torch for ml/dl tasks - terraform and ansible for cloud deployment and automation - ssh keyring setup - xfce Desktop on two screens - VPN Connections to some of our clients - Remmnia as RDP Client with a lot of configured connections I don't want to loose - ... and so on My question is how to safely get most of my tweaks over to the fresh installed distro? 1. Do I even need to format the /home partition? 2. If I don't format it and use the same usernames, will my ~/ Folder find its way back? 3. Better just copy data and profiles onto an external disk and copy back the things I need in the moment I really need it (I am afraid that I will have to keep this backup for years)? 4. which other parts of the filesystem should I backup? (How to know where for example Remmnia is saving its connection configurations) 5. Is there a dnf command to quickly export a list of installed packages which can be used for reinstall on the fedora machine then? Generally: How would YOU do that?