IRIS Back-up process

Concerning the Signal Management process, what would be the alternative in case IRIS is out of order to submit an Annual Statement or a signal? Should we use Eudralink or any other way to declare ? 
Thank you in advance for your clarification on the back-up procedure. 

Considering that IRIS is online 24/7 and that in 6 years of operation there have been no significant periods of unavailability, annual statements, signal or other IRIS-based submissions should always be sent via IRIS.