Maintain a bootable clone of Mac OS X volume

## rsync_backup
#!/bin/sh

PROG=$0
RSYNC="/usr/bin/rsync"
SRC="/"
DST="/Volumes/Backup/"

# rsync options
# -v increase verbosity
# -a turns on archive mode (recursive copy + retain attributes)
# -x don't cross device boundaries (ignore mounted volumes)
# -E preserve executability
# -S handle spare files efficiently
# --delete delete deletes any files that have been deleted locally
# --exclude-from reference a list of files to exclude

if [ ! -r "$SRC" ]; then
 /usr/bin/logger -t $PROG "Source $SRC not readable - Cannot start the sync process"
 exit;
fi

if [ ! -w "$DST" ]; then
 /usr/bin/logger -t $PROG "Destination $DST not writeable - Cannot start the sync process"
 exit;
fi

/usr/bin/logger -t $PROG "Start rsync"

sudo $RSYNC -vaxE -S --delete --exclude-from=$HOME/rsync_excludes.txt "$SRC" "$DST"

/usr/bin/logger -t $PROG "End rsync"

# make the backup bootable
sudo bless -folder "$DST"/System/Library/CoreServices

exit 0

## rsync_excludes.txt
.Spotlight-*/
.Trashes
/tmp/*
/Network/*
/cores/*
/afs/*
/automount/*
/private/tmp/*
/private/var/run/*
/private/var/spool/postfix/*
/private/var/vm/*
/Previous Systems.localized
/Volumes/*
*/.Trash