We had probelms with long backup times - nearly 24 hours for a site with about 800 small courses. We do have a large number of student accounts on the system - 4000+. We found that changing the setting for 'Users' in the backup settings from the default value of 'All' to 'Users' cut backup times down to just over an hour!
Hardware and performance
Cron Execution can last 5+ hours
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