The new board has already a stored backup file in the local flash (but
with another functionality than the one that will be replaced).
Because there is a backup file in the local flash it will be used
for restoring the data. But because of the board replacement the MAC
address of the board has changed. Therefore Backup & Restore is contacted
to perform a restore with the backup file of the backup server. After
the restore from the backup server the correct data is configured on
the board. In this case the backup server must be reachable otherwise
the board has stored the wrong configuration data.
After the restore the backup of the local flash should be updated
with the current configuration data.
