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justinmklam/backup-sd-card-to-file.md

Last active August 13, 2023 15:58
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Backup SD card to file using dd
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backup-sd-card-to-file.md

To find the partition, use the command:

$ df

The output will be something like below. In this case, the SD card is on /dev/mmcblk (ignore the two partitions).

Filesystem      Size  Used Avail Use% Mounted on
udev            7.8G     0  7.8G   0% /dev
tmpfs           1.6G  2.5M  1.6G   1% /run
/dev/nvme0n1p3  263G   36G  214G  15% /
tmpfs           7.8G  817M  7.0G  11% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           7.8G     0  7.8G   0% /sys/fs/cgroup
/dev/nvme0n1p2  515M  110M  406M  22% /boot/efi
tmpfs           1.6G   16K  1.6G   1% /run/user/118
tmpfs           1.6G   76K  1.6G   1% /run/user/1000
/dev/mmcblk0p1  253M   52M  201M  21% /media/jlam/boot
/dev/mmcblk0p2   15G  3.3G   11G  24% /media/jlam/rootfs

Execute the following to copy the SD card to an image file.

$ sudo dd if=/dev/mmcblk0 of=pi-backup.img status=progress
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