Dropbox as incremental backup

gistfile1.sh

# http://finishtherace.net/wp/?p=622

# Dropbox as incremental backup.
# Justin Schwalbe
# http://finishtherace.net/wp/?p=622

password="trickypassword"
dropboxdir="~/Dropbox/backups/"  #change this as needed, make sure it exists
backupfolders="/path/to/folder /path/to/second/folder /and/so/on"

##############################
# No need to edit below this #
##############################

datestring=`date +%d`
thisyear=`date +%y`
thismonth=`date +%m`

# seems dumb and redundant, but it is sorta needed
mkdir /tmp/Backups; cd /tmp/Backups
tar -czf backup$datestring.tgz  $backupfolders
tar -zxf backup$datestring.tgz
rm backup$datestring.tgz

# hdiutil won't overwrite files, so if it exists, delete it.
if [ -f $dropboxdir/backup$datestring.dmg ]
then
	rm $dropboxdir/backup$datestring.dmg
fi

# create the .dmg file
hdiutil create -srcfolder '/tmp/Backups' -encryption -passphrase $password -fs HFS+ -volname Backup$thismonth.$datestring.$thisyear 
$dropboxdir/backup$datestring

# clean up our mess so tomorrow we can start fresh
rm -rf /tmp/Backups