To clarify, cnMaestro does currently support manually backing up ePMP and PMP devices in bulk. This specific request is to automate the process using scheduled jobs or API support. I didn’t see that mentioned in the linked posts but I may have missed it. It sounds like we need to clean up some of the completed features in the Ideas section.
Configuration backup is available in the On-Premises release. At the system level go to the Configuration tab and scroll down to the Global PMP/ePMP/cnReach Configuration Backup section. From here you can backup all devices, export their configuration for offline storage, import that file back and restore backups to devices.
At the device level you can create and apply backups but not perform import/export.