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The diskutil said that my SD card is located on /dev/disk4, so I typed
sudo dd if=/dev/rdisk4 of=~/Desktop/backup.img bs=1m
to backup my SD card. But there is a message
dd: ~/Desktop/backup.img: No such file or directory
What's the problem?
If you are using sudo i.e. running with root permission you DO NOT have ~ as shortcut for your home directory.
Use FULL PATHS or cd to the target directory.
sudo dd if=/dev/rdisk4 of=backup.img bs=1m