I have Home assistant installed on a SD card (with Home Assistant OS) and the data stored on a connected SSD disk. I need a reinstall of my SD card because HA crashed daily.
How can I rebuild such a configuration?
You can navigate to Settings → System → Backups
and create a full backup of your configuration, addons and integrations. You have to take the backup file from the sd card before formatting it, with a program like WinSCP
Otherwise, you can install and configure the Home Assistant Google Drive Backup addon so you will be able to download backups from your Google Drive (the easiest way)
So, after reinstalling home assistant, restore the backup you have. Instructions here: How to restore a backup - Community Guides - Home Assistant Community (home-assistant.io)
I was mainly concerned that data disk is already separated from SD card.
But now I have rebuild a new SD card and start Raspberry from newly build SD card. The data disk will be automatically found and all is in place. 
The only thing I had to do is correct my IP configuration. Really cool