Backup script using hardlinks

backup.sh

#!/bin/bash
## Source dirs or files to be copied
SRC="/list/of/dirs/space/separated /another/dir"

## Exclude-args, let it be empty if nothing is to be excluded
EXCLUDE_FROM="--exclude-from=/path/to/exclude/file"

## Destination host (including user if necessary, user@host)
DEST_HOST="[email protected]"

## Destination dir without trailing slash
DEST_DIR="backup"

## Rsync arguments
RSYNC_ARGS="-avz --relative --delete --delete-excluded $EXCLUDE_FROM"


## Start of script

if [ $# != 2 ]; then
	echo "Usage: backup.sh interval_name count"
	exit 1
fi

NAME=$1
COUNT=$2

TIMESTAMP=`date -u "+%Y-%m-%d %H:%M:%S%z"`
echo "*** Backup started $TIMESTAMP (interval $NAME, count $COUNT) ***"

echo "Deleting $DEST_DIR/$NAME.$((COUNT-1))"
ssh $DEST_HOST rm -rf $DEST_DIR/$NAME.$(($COUNT-1))

for i in `seq $(($COUNT-1)) -1 2`;
do
	j=$(($i-1))
	echo "Moving $DEST_DIR/$NAME.$j to $DEST_DIR/$NAME.$i"
	ssh $DEST_HOST mv $DEST_DIR/$NAME.$j $DEST_DIR/$NAME.$i
done

echo "Copying $DEST_DIR/$NAME.0 to $DEST_DIR/$NAME.1"
ssh $DEST_HOST cp -al $DEST_DIR/$NAME.0 $DEST_DIR/$NAME.1

echo "Copying source ($SRC) to $DEST_HOST:$DEST_DIR/$NAME.0/"
rsync $RSYNC_ARGS $SRC $DEST_HOST:$DEST_DIR/${NAME}.0/
ssh $DEST_HOST touch $DEST_DIR/$NAME.0

TIMESTAMP=`date -u "+%Y-%m-%d %H:%M:%S%z"`
echo "*** Backup ended $TIMESTAMP ***"
echo "Quota as follows:"
ssh $DEST_HOST quota