Rhel 9.2 wich files to make a backup of to start again after crash

Hello,

I want to understand wich exact files I need to make a copy to just fire the server up again and works right away.

I am running a server with this config:
HP G1 800 i7 32gb mem

RHEL 9.2 Server with gui.

VM:
1. Windows 11
2. OPNsense with wireguard for acces outside. (Only port for wireguard is open in my router) my first router is a kpn for now. Not made a transistion yet to fully use OPNsense.
3. Truenass Scale for Samba share ( works flawlessly with wireguard vpn)
Assign 4 disks to this vm for zfs raidz2
4. Homeassistant (for Tasmota and knx devices)

The VM qcow files are on a different drive then Rhel.

Rhel is now located on 1 disk. Not really redundancy proof any tips maybe?

Sorry for my messy question! I am a bit ADD and my main job is drawing electric plans for building autocad and stabicad. But my internet in complicated smart ict corner is what I also really want to learn more.
So I was reading and found about linux and then the main used steady commercially product. So I stumble on RHEL.
I works flawlessly for a very long time! No problems when I don’t change things! Had a few emergency mode startup problems but fixed those after reading the journal and googling.

Now I want reproduced more to a real word configuration instead of go and it works. For instance I now use root to login. I know it is not good but for the ease I dit not changed it yet. I searched and found redhat had freeotp and I installed the freeipa server etc but now I want to learn first wich files to copy and backup because I dont want to lose everything:)

Let me know if you understand me and could help me:)

I do had a suggestion to read thomas limoncello book.
Haven’t done that yet.

Regards,

Wouter van Zijl