How to perform hot backup for InnoDB?
You can buy the official backup tool - "InnoDB Hot Backup" if you have the money. But you can also use the free alternative - the Percona XtraBackup
To download and install, you can refer to their web site: http://www.percona.com/docs/wiki/percona-xtrabackup:installation:binaries
To perform a quick and simple backup, you need:
# sudo xtrabackup --defaults-file=/etc/mysql/my.cnf --backup --target-dir=/tmp/backup --datadir=/var/lib/mysql