The basic format of the commands are as follows;
dd if=/dev/sdb of=/tmp/backup-file
dd if=/dev/backup-file of=/dev/sdb
where /dev/sdb is the CF card or other portable storage device and /tmp/backup-file is the backup file.
NOTE: We are using /dev/sdb and NOT /dev/sdb1 as we'd possibly expect.
The first command creates the backup, the second, the restoration.
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