After the activation of the license on the device, the license should be backed up so that it is available for a re-installation of the SD/OS image.
A soft license can only be restored on the same Raspberry Pi and cannot be transferred to another.
Alternatively, there is a possibility to use a dongle that can be used on any Raspberry Pi.
There are two possibilities to do this:
Both possibilities can be used independently of each other (alternatives to backup methods)
Copy the file 3SLicenseInfo.tar to the directory restore and restart the PLC.