A script to make backups with rsync easier (built a long time ago)

do_backup.sh

#!/bin/bash

ORIGIN_LOCATION=$1
BCK_LOCATION=$2

if [[ ! -d "${ORIGIN_LOCATION}" ]]; then
    echo "NEEDS A SOURCE LOCATION!"
    exit 244
fi


if [[ "x${BCK_LOCATION}" == "x" ]]; then
    echo "NEEDS A BACKUP LOCATION!"
    exit 245
fi

BCK_VERSION=`date +'%Y%m%d%H%M%S'`

if [[ -h "${BCK_LOCATION}/current" ]]; then
    REAL_LOCATION=`readlink ${BCK_LOCATION}/current`
    cp -al "${BCK_LOCATION}/${REAL_LOCATION}/." "${BCK_LOCATION}/bck_${BCK_VERSION}"
    rm "${BCK_LOCATION}/current"
fi

mkdir -p "${BCK_LOCATION}/bck_${BCK_VERSION}"
rsync -av --one-file-system --delete "${ORIGIN_LOCATION}" "${BCK_LOCATION}/bck_${BCK_VERSION}"
RES_RSYNC=$?

if [[ "x${RES_RSYNC}" != "x0" ]]; then
    rm -rf "${BCK_LOCATION}/bck_${BCK_VERSION}"
    if [[ "${RES_RSYNC}" == 127 ]]; then
        echo "O Gil usa distros parvas sem rsync by default"
    fi
    exit ${RES_RSYNC}
fi

ln -s "bck_${BCK_VERSION}" "${BCK_LOCATION}/current"