Duplicity backup script

duplicity_backup.sh

#!/bin/bash

# Backup all important files on my computer using Duplicity

# Folders to include
include_directories=(/home/me /etc)

# Folders to exclude
exclude_directories=()

# duplicity path to backup to.
destination=ssh://otherComputer/backup/myComputer

# Set passphrase
export PASSPHRASE="Secure passphrase here.  Don't forget to back me up!"

# Log directory
LOG_DIRECTORY=/home/me/log

# ======= NOTICE ================================
# You probably don't need to edit below this line.
# You have been warned!
# ================================================

# Setup some variables
SCRIPT_FILENAME=$(basename $0)
TIMESTAMP=`date +%m%d%Y-%H%M`
BACKUP_LOG_FILE="$LOG_DIRECTORY/$SCRIPT_FILENAME""_$TIMESTAMP.log"

# If duplicity is already running then exit
if [ $(ps aux | grep 'duplicity' | grep -v "grep\|$SCRIPT_FILENAME" | wc -l | tr -s "\n") -ne 0 ]; then 
  echo "Duplicity is already running, exiting."
  exit
fi

include_parameters=""
for include_directory in ${include_directories[*]}
do
  include_parameters="$include_parameters --include $include_directory"
done

exclude_parameters=""
for exclude_directory in ${exclude_directories[*]}
do
  exclude_parameters="$exclude_parameters --exclude $exclude_directory"
done

# Run duplicity without logs to check for prompts.
duplicity collection-status \
  $include_parameters $exclude_parameters \
  --exclude '**' \
  "$destination"

# Run duplicity backup.
duplicity \
  $include_parameters $exclude_parameters \
  --exclude '**' \
  --full-if-older-than 1Y \
  / "$destination" 2>&1 | tee $BACKUP_LOG_FILE

# Only keep around 1 full backup.
echo -e '\n\n==== REMOVE OLD BACKUP SETS ====\n\n' >> $BACKUP_LOG_FILE
duplicity remove-all-but-n-full 1 \
  "$destination" 2>&1 | tee -a $BACKUP_LOG_FILE

# Clear passphrase
export PASSPHRASE=