Copy/Backup a SD Card

After some failures there is an easy way to copy a  Raspberry Pi SDCard (with Homematic CCU running in a lxc container) from one SD Card /dev/sdb to another SC Card /dev/sdc:

mount (to see the mounted filesystems an their names)
umount /dev/sdb1
umount /dev/sdc1
sudo dd if=/dev/sdb of=/dev/sdc bs=4096 conv=notrunc,noerror
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