Make full sd card image backup of running OpenWrt

[sumo]

BTW: Have you seen that thread? Talks about A/B images and backup.

[dual-firmware] A question about Backup

In view of an upcoming firmware upgrade I ask: Is it possible to backup all the additional applications installed on openwrt with their settings and then be able to restore them once they perform the upgrade? This need derives from the fact that those who have a router with double firmware, in order not to lose the original firmware, cannot / must do sysupgrade so every time there is an update, it must be done from the desk with the original firmware. I understand that the backup function does n…