title: Why is percona xtrabackup so slow and big
body: <p>When I call innobackupex with no arguments, it produces a backup of all databases. It takes three minutes, and produces an 8gb output. When I run mysqldump --all-databases, it takes 1 minutes, and produces a 1.5gb output. Since both of these outputs can be used to recreate the same database, why is xtrabackup so much slower and larger?</p>