如何使用bash备份LAMP服务器？

Question

我写了一个bash脚本来备份我的LAMP服务器。老实说，这是我第一次接触bash，因此我想请教您一些改进方面的帮助。

#!/bin/bash

date=`(date +%Y%m%d%H%M)`

declare -A users=(
    ["user1"]="password1"
    ["user2"]="password2"
)

for user in ${!users[@]}
do
    directory=$user

    directories=`find /var/www/$directory -maxdepth 1 -mindepth 1 -type d`

    for directory in $directories
    do
        cd $directory

        if [ ! -d backups ]
        then
            mkdir backups
        fi

        tar --exclude ./backups -czf backups/$date.tar.gz .

        password=${users[$user]}

        databases=`mysql -u $user -p$password -Bse "SHOW DATABASES;"`

        for database in $databases
        do
            if [ $database = ${directory##*/} ]
            then
                mysqldump -u $user -p$password $database | gzip > backups/$date.sql.gz
            fi
        done

        chmod 770 backups -R
        chown $user:$user backups -R
    done
done

谢谢！