Added missing command.

_posts/2019-02-23-my-backup-system.md

@@ -1,7 +1,7 @@
 ---
 title: My backup system
-tags: [bash, shell, backup, rsync, LUKS, cryptsetup, sync]
-updated: 2019-05-01 17:30
+tags: [bash, shell, backup, rsync, LUKS, cryptsetup, sync, shred]
+updated: 2019-06-20 19:06
 description: A detailed exaplanation of my backup system which is both encrypted and unencrypted for different purposes.
 ---
 
@@ -85,9 +85,10 @@ I also keep two different types of incremental backups. It's not exactly the *3
        # chown 700 backup_{root,data}{_enc,}
        # popd
 
-3. Partition, format and mount the unencrypted hard disks. You should use 
+3. Shred, partition, format and mount the unencrypted hard disks. You should use 
    fstab instead of mounting the filesystems manually
 
+       # shred /dev/sd{x,y} -n1 --random-source=/dev/urandom --verbose
        # fdisk /dev/sd{x,y}
        # mkfs.ext4 /dev/sd{x,y}1
        # mount /dev/sd{x,y}1 /mnt/backup_{root,data}