Complete backup

Hi,

I am running openwrt on a device with nand-flash and wonder if it is possible to create a complete backup of the system in a format that would allow the backup to be restored by flashing it with uboot.

Many thanks!

There is no generic approach to that, even less a safe one - I'd strongly recommend against that.

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I agree with @slh: Use the built-in backup feature to save all configuration files. If you need to restore and OpenWrt is still functional, reset to defaults, restore your backup and install required packages. If OpenWrt doesn't boot, do a clean reinstall and restore the backup.