BACKUP_LOCATION=/backup

function Backup {
  if [ -z "$1" ]; then
    echo "Specify a file."
    return 1
  fi

  if [ "$(echo $1 | grep "^/")" ]; then
    FILE=$1
  else
    FILE=$PWD/$1
  fi

  if [ ! -f $FILE ]; then
    echo "File to backup ($FILE) does not exist."
    return 2
  fi

  echo Backup $FILE...

  mkdir -p $BACKUP_LOCATION$(dirname $FILE) 2>/dev/null && \
    cp $FILE $BACKUP_LOCATION$FILE && \
    echo $FILE >> $BACKUP_LOCATION/index.lst
}

function Restore {
  cat -n $BACKUP_LOCATION/index.lst
  echo "Enter numbers of files to restore:"
  read NUMBERS
  for FILE in $NUMBERS; do
    NAME=$(sed -n "${FILE}p" $BACKUP_LOCATION/index.lst)

    echo "Restore $NAME..."
    cp $BACKUP_LOCATION$NAME $NAME
  done
}

. ./BackupScript

Backup filename

Restore

function Backup {
  if [ -z "$1" ]; then
    echo "Specify a file."
    return 1
  fi

  if [ "$(echo $1 | grep "^/")" ]; then
    FILE=$1
  else
    FILE=$PWD/$1
  fi

  if [ ! -f $FILE ]; then
    echo "File to backup ($FILE) does not exist."
    return 2
  fi

  echo Backup $FILE...

  mkdir -p $BACKUP_LOCATION$(dirname $FILE) 2>/dev/null && \
    cp $FILE $BACKUP_LOCATION$FILE
}

function Restore {
  find $BACKUP_LOCATION -type f | cat -n
  echo "Enter numbers of files to restore:"
  read NUMBERS
  for FILE in $NUMBERS; do
    NAME=$(find $BACKUP_LOCATION -type f | sed -n "${FILE}s+$BACKUP_LOCATION++p" )

    echo "Restore $NAME..."
    cp $BACKUP_LOCATION$NAME $NAME && rm $BACKUP_LOCATION$NAME
  done
}