backup.sh

#!/bin/bash
 
# Create the lock file to prevent parallel instances.
LOCKFILE=/tmp/.backup.sh.lck
if [ -e ${LOCKFILE} ] && kill -0 `cat ${LOCKFILE}`; then
    echo "already running"
    exit
fi
 
# make sure the lockfile is removed when we exit and then claim it
trap "rm -f ${LOCKFILE}; exit" INT TERM EXIT
echo $$ > ${LOCKFILE}
 
# What to backup. 
backup_files="/home/jake /root /var /etc"
 
# Where to backup to.
dest="/backup"
 
# Set the bandwidth limit in KBytes.
bwlimit=25000
 
# What to exclude
excludes=".cache"
 
# To infinity and beyond!
sudo rsync --bwlimit=$bwlimit --exclude=$excludes -Pav $backup_files $dest
 
# Remove the lock file after a succesful backup.
rm -f ${LOCKFILE}