Add backup script

Backup/README.md

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+This backup script tries to achieve Time Machine-like functionality using rsync
+
+It is meant to be run by an hourly cronjob
+
+Backups in the backup directory will be named in the form of "YYYY-MM-DD-HHMMSS", with "current" always being a symlink to the latest backup

Backup/backup.sh

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+#! /bin/bash
+
+backup=/var/backup
+date=$(date "+%Y-%m-%d-%H%M%S")
+mysqlpw="AAAAAAAAAA"
+
+mkdir -p $backup/$date/www
+rsync -ax --delete --exclude='.git*' --exclude='misc/*' --link-dest=$backup/current/www/ /var/www/ $backup/$date/www/
+mysqldump --single-transaction --password="${mysqlpw}" gazelle | gzip -c > $backup/$date/gazelle.sql.gz
+
+rm $backup/current
+ln -s $backup/$date $backup/current
+
+# One backup per day for backups older than 12 hours
+hourlies=$(find $backup -maxdepth 1 -type d -mmin +720 | sort)
+day=0
+for i in $hourlies; do
+	rday=$(echo $i | awk -F '-' '{print $3}')
+	if [[ $rday = $day ]]; then
+		rm -r $i
+	else
+		day=$rday
+	fi
+done
+
+# One backup per month for backups older than two weeks
+monthlies=$(find $backup -maxdepth 1 -type d -mtime +14 | sort)
+month=0
+for i in $monthlies; do
+	rmonth=$(echo $i | awk -F '-' '{print $2}')
+	if [[ $rmonth = $month ]]; then
+		rm -r $i
+	else
+		month=$rmonth
+	fi
+done