SD Disk Copying

Installing and Using OpenWrt
1

I have installed OpenWRT on a Raspberry Pi 4B, and have a basic router working. I would like to add several more packages, NAS, an ad blocker, Apache and miniDLNA. Maybe others.

But first I would like to clone my working micro SD card so if I make a mistake I can recover easily. I am unable make a copy using Raspian's SD Card Copier.

Is there an easy, safe way to make a perfect copy of a working OpenWRT SD card?

2

You can copy the disk with dd utility in linux.
Or you could use the imagebuilder to prepare the image with the extra packages and settings.

3

Be aware that keys and possibly entropy will also be cloned which is probably not what you want...