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Make sure the file contents can't be retrieved if anyone gets ahold of your physical hard drive.
With hard drive partition:
gpg --default-recipient-self -o /path/to/encrypted_backup.gpg -e /dev/sdb1 && shred -z /dev/sdb1
WARNING/disclaimer: Be sure you... F&%k it--just don't try this.
This command remove a file from your filesystem like the normal rm command
but instead of deleting only the inode information this also delete the data that was stored on blocks
/!\ warning this may be long for large files