Incremental rsync backups

backup.sh

#!/bin/bash
trap "echo Exited!; exit;" SIGINT SIGTERM

SOURCE="/home/" # Path to data needs backup

YESTERDAY=`date -I -d "1 day ago"`
TODAY=`date -I`

SERVER="user@server"
STORAGE="/storage/backup"
LAST_LINK=`ssh $SERVER "ls -c $STORAGE | head -n 1"`

if [ -z $LAST_LINK ]; then
  LINK="$STORAGE/$YESTERDAY"
else
  LINK="$STORAGE/$LAST_LINK"
fi

TARGET="$STORAGE/$TODAY"
MAX_RETRIES=10

#
# Configuration end
#

i=0
# Set the initial return value to failure
false

while [ $? -ne 0 -a $i -lt $MAX_RETRIES ]
do
 i=$(($i+1))
 rsync -aqhe ssh --exclude=".gvfs*" --exclude="gvfs*" --delete --link-dest="$LINK" "$SOURCE" "$SERVER:$TARGET"
done

if [ $i -eq $MAX_RETRIES ]
then
  echo "Hit maximum number of retries, giving up."
fi