I believe this can be done either by setting up a (T)FTP server and instruct the router to make a backup or get one from the server, either with a CLI terminal. Method one requires setting up a 3P server. That is an easy thing to do by our customers (we'd typically not do that since access control and security is typically managed by our customers IT teams). Method 2 is not as common tmo, but does not need the deployment of a (T)FTP server.
Of course, we could also include a (T)FTP server with our DataMiner IDP deployment itself and ensure that it is setup in a secure manner. To be discussed together with the PO on how to approach this best. We have D2D communication with the Cisco team as well, so we can include our peers in the conversation and made the optimal choice.