Plug Micro SD card with reader or plug in USB flash into Linux box
fdisk -l ... Disk /dev/sdd: 16.6 GB, 16574840832 bytes ...
Back it to file:
dd if=/dev/sdd of=/root/yun-sd-card.bin
Linux dd Command Show Progress Copy Bar With Status:
http://www.cyberciti.biz/faq/linux-unix-dd-command-show-progress-while-coping/
Monitor Progress of Data Sent Via a Pipe:
http://www.cyberciti.biz/open-source/command-line-hacks/pv-command-examples/
Install pv:
apt-get install pv
Back up it to file:
15.4GB 0:15:03 [17.5MB/s] [==================================>] 100% 4046592+0 records in 4046592+0 records out 16574840832 bytes (17 GB) copied, 903.16 s, 18.4 MB/s
Restore from backup file to new Micro SD card:
pv -tpreb /root/yun-sd-card.bin | dd of=/dev/sdd bs=4096 conv=notrunc,noerror
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