Backup minecraft world and clear stale backups

BackupMinecraft.sh

#!/bin/bash

DATE=`date`
BASE_DIR="{set-a-base-dir}"
FOLDER_TO_COMPRESS="$BASE_DIR/minecraft"
BACKUPS_FOLDER="$BASE_DIR/backups"

FILE_NAME_FORMAT=`date +"%Y-%h-%d_%H-%M"`
TAR_FILE="$BACKUPS_FOLDER/$FILE_NAME_FORMAT.tar.gz"

LOG_DIR="$BACKUPS_FOLDER/logs"
LOG_FILE="$LOG_DIR/$FILE_NAME_FORMAT.log"

mkdir -p $LOG_DIR

echo "Backing up world $FOLDER_TO_COMPRESS at $DATE to $TAR_FILE" >> $LOG_FILE

tar -zcvf $TAR_FILE $FOLDER_TO_COMPRESS >> $LOG_FILE

FILE_SIZE=`du $TAR_FILE -h | cut -f 1`

echo "Finished backing up $TAR_FILE of size $FILE_SIZE" >> $LOG_FILE

echo "Clearing backups" >> $LOG_FILE

MAX_FILES=5
cd $BACKUPS_FOLDER
FILES=`ls -1t *gz | wc -l`
if [ $FILES -gt 2 ]
  then
    echo "There are $FILES files, Max allowed is $MAX_FILES" >> $LOG_FILE
    TO_DELETE=`expr $FILES - $MAX_FILES`
    echo "Deleting $TO_DELETE oldest backups" >> $LOG_FILE
    ls -1t *gz | tail -n $TO_DELETE | xargs --verbose -d '\n' rm -f >> $LOG_FILE
  fi