backup script daily

#!/bin/bash

snapshotDir=/path/to/backup/dir

if [ -d $snapshotDir/daily.2 ]
then
    rm -rf $snapshotDir/daily.2
fi

if [ -d $snapshotDir/daily.1 ]
then
    mv $snapshotDir/daily.1 $snapshotDir/daily.2
fi

if [ -d $snapshotDir/daily.0 ]
then
    mv $snapshotDir/daily.0 $snapshotDir/daily.1
fi

if [ -d $snapshotDir/hourly.0 ]
then
    cp -al $snapshotDir/hourly.0 $snapshotDir/daily.0
fi