#!/bin/bash

## configuration {
BACKUP_DIR="ABSOLUTE_PATH_TO_BACKUP_DIR"
DBNAME="UR_DB_NAME"
DBUSER="UR_DB_USER"
DBPASSWD="UR_DB_PASSWORD"
DATE_TEMPLATE="$(date '+%Y.%m.%d %H-%M')"
DAYS_TO_STORE=30
## }

fname="${BACKUP_DIR}/${DBNAME}_${DATE_TEMPLATE}.sql"

# ensure existence of $BACKUP_DIR
mkdir -p "${BACKUP_DIR}"

mysqldump --routines --user="${DBUSER}" --password="${DBPASSWD}" "${DBNAME}" > "${fname}"
nice -n 20 gzip --best "${fname}"

# delete old backups
find "${BACKUP_DIR}" -type f -name "*.gz" -ctime "+${DAYS_TO_STORE}" -delete