by Alain Raap.
Andrej, what's the size of your MySQLdatabase and have you loaded your database in-memory (InnoDB)? I understood you already did the tuning for better performance. A slave replication could be a solution, with a Moodle instance (without Apache) on that server. I believe I described in the link https://moodle.org/mod/forum/discuss.php?d=385643 how to configure this instance. Running the automated backup directly on the DB / data server was our solution for running the batch in a cron job during the night. Next morning all our backups (about 300/400 backups each night) were ready. Where resides your moodledata, on the same server as Apache and MySQL?