PS what you perhaps 'could' do, if all you have is 1 raspi and 1 card reader,
is boot from some other HUGE[1] SDcard.

Take the original card and put it in the card reader
copy it to file with dd
dd if=/dev/cardreder of=image1.img


Now you have the backup.

You could then also copy back to some other card,
put new card in cardreader
dd if=image1.img of=/dev/cardreader


All as root, use sudo if you have root fear.

[1] must have enough space for the OS and apps and the image.


Having a PC or laptop with large hardisk, could not do a thing without.
Important backups also go to bluray here.

So FLASH, magnetic, AND optical.
AND I have some MDISKs, supposed to last a century.

Reality rules, if there was a simpler way I'd use it.
Greetings
Jan

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