Plug the SD in your Mac.
In the Terminal, as root, use diskutil to identify your SD.
Generally it’s the last in the list, if you’ve just plugged in.
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root:~ # diskutil list |
You will see something like this:
In my case, the SD is /dev/disk4. For this reason, I run the following to unmount the whole disk.
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root:~ # diskutil umountDisk /dev/disk4 Unmount of all volumes on disk4 was successful |
Once done, you can create the backup using dd utility, but make sure to change the device from /dev/diskX to /dev/rdiskX, adding the “r“.
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root:~ # dd if=/dev/<span style="color: #ff0000;">rdisk4</span> of=/path/to/mypibackup.img bs=1m |
To restore, of course… invert if (input file) with of (output file)… 🙂
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root:~ # dd if=/path/to/mypibackup.img of=/dev/rdisk4 bs=1m |