quick-n-dirty regular backup script

backup.sh

#!/bin/bash                                                                     
## Doesn't copy already existing files if they are in the previous backup 
## First do echo "initial" > LASTBACKUP.dat then mkdir Backup-initial && cd Backup-initial && rsync -a --progress /source/path . && cd ..

DATE=`date +"%Y%m%d"`                                                                  
LASTD=`cat LASTBACKUP.dat`

echo -ne "\n\nBackup script\n ========="
echo -ne "\n\nBacking up to: Backup-$DATE\n"
echo -ne "Previous Backup: Backup-$LASTD\n\n"

if [ ! -d "Backup-$LASTD" ]; then
    echo "ERROR: Last backup not there"
    exit 1
fi
sleep 3
if [ ! -d "Backup-$DATE" ]; then
    mkdir Backup-$DATE
fi
cd Backup-$DATE
rsync -rtlDP --exclude=.cache /source/path --link-dest=../Backup-$LASTD .
if [ "$?" -eq 0 ]; then
    echo "Backup success!"                    
    echo -ne "\n\n Ctrl-C to stop LASTBACKUP.dat update\n\n"
    sleep 20
    cd ..
    echo "$DATE" > LASTBACKUP.dat
    rm ./current
    ln -s ./Backup-$DATE current
else
    echo "nope"       
fi