Change-aware Minecraft backup script

backup-minecraft.sh

#!/bin/bash

dateStr="`date +"%Y%m%d%H%M"`"
fileNamePrefix="name-of-backup"
tarFileName="${fileNamePrefix}-${dateStr}.tgz"

#echo "tarFileName: ${tarFileName}"

cd "/Users/USERNAME/Library/Application Support/minecraft"
lastBackupFile=`ls -rt | grep $fileNamePrefix | awk 'NR==0; END{print}'`

#echo "lastBackupFile: $lastBackupFile"

if [ -n "$lastBackupFile" ]; then
    numNewerFiles=`find . -mnewer ${lastBackupFile} | egrep -e "(saves|options|launcher_profiles|screenshots)" | wc -l | awk {'print $1'}`
    #echo "numNewerFiles: $numNewerFiles"
    if [ "$numNewerFiles" -gt "0" ]; then
        #echo "Found newer files since last backup... creating backup"
        tar -zcvf $tarFileName saves screenshots launcher_profiles.json options.txt
        scp $tarFileName user@HOST:/backup/path/
    fi
else
    #echo "No last backup file found... creating backup"
    tar -zcvf $tarFileName saves screenshots launcher_profiles.json options.txt
    scp $tarFileName USER@HOST:/backup/path/
fi

I have this run once every hour via cron.

0 * * * * backup-minecraft.sh