Hello @StephaneB !
So currently the Gladys Plus backup saves Gladys’s database, and that database contains the information necessary to correctly restart the MQTT and Zigbee2mqtt integrations (it’s a recent development that required a lot of work and has been available since 4.18: Gladys Assistant 4.18 : Sauvegarde Zigbee2mqtt et gestion native des boutons (clic simple, double, ...))
However, your Python server is not backed up (which is logical :p), and Node-RED isn’t either.
To back up your Node-RED, see what the Node-RED project recommends for automatic backups (if you want to automate it); otherwise what @cce66 suggests also works manually
Note that for now this request only talks about launching Node-RED, not backing it up. I don’t even know if Node-RED offers an API to retrieve a backup (like Zigbee2mqtt does, for example).