backup script

backup.sh

#!/bin/bash 

TARGET="/root/foundry"
DESTINATION="/root/backups"
BACKUPS_TO_KEEP=20
NOW=`date -u +"%Y-%m-%dT%H:%M:%SZ"`

slow() {
start=`date +%s`
tar -cvJf "$DESTINATION/$NOW.tar.xz" $TARGET
end=`date +%s`
echo Backup took `expr $end - $start` seconds.
}

fast() {
start=`date +%s`
tar -cvzf "$DESTINATION/$NOW.tar.gz" $TARGET
end=`date +%s`
echo Backup took `expr $end - $start` seconds.
}

cleanup() {
N=$(($BACKUPS_TO_KEEP + 1))
(cd $DESTINATION && ls -tp | grep -v '/$' | tail -n +$N | xargs -I {} rm -- {})
}

### Main ###

if [ "$1" = "" ]; then
  fast 
  cleanup 
else
  while [ "$1" != "" ]; do
  case $1 in
    -s | --slow )      shift
                       slow 
                       ;;
    -f | --fast )      fast 
                       ;;
    -c | --cleanup )   cleanup 
                       ;;
    * )                echo "invalid flag: $1" 
                       exit 1
  esac
  shift
done
fi