Backup script

simple_home_backup.sh

#!/usr/bin/env bash
# Author: Alex Baranowski

# This is trivial backup script
# Backup should be done on **different** physical disk, and as any other file can be moved &&|| replicated.

# Stop on the first error
set -e

[[ -v "$KEEP_DAYS" ]] || KEEP_DAYS=120
[[ -v "$BACKUP_THIS" ]] || BACKUP_THIS="$HOME"

[[ -v "$BACKUP_TO" ]] || BACKUP_TO="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )/backup"
echo "kD $KEEP_DAYS, BT: $BACKUP_THIS, BTO, $BACKUP_TO"
[ -d "$BACKUP_TO" ] || mkdir "$BACKUP_TO"

# create,verbose,permissions, gZip, file
ARGS="-cvpzf"
# Pigz cannot be used with z
hash pigz 2> /dev/null && ARGS="--use-compress-program=pigz -cvpf"

# In most cases .cache can be savely omited.
tar $ARGS "$BACKUP_TO/backup-$(date +%F).tar.gz" \
  --exclude="$BACKUP_THIS/.cache" \
  --exclude="$BACKUP_THIS/.local/share/Trash" \
  $BACKUP_THIS

echo -e "\n\nRemovingbackup older than $KEEP_DAYS\n\n"
find $BACKUP_TO -mtime +${KEEP_DAYS} -exec rm -v {} \;