dagda_save_platform() function, which can only be called
from a client, records all the data managed by the agents' or SeDs'
DAGDA components that allow it.
Then, the ``restoreOnStart'' configuration file option asks to the DAGDA component to restore the data stored on the ``dataBackupFile'' file when the component starts. This mechanism allows to stop the DIET platform for a while and restart it conserving the same data distribution.