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This is a meta bug to keep track of issues with backups due to performance
USERS section is processed twice one restore, only one should be necessary
backuplib.php performance improvement for the function full_tag()
META: Backup & restore 2.0
A huge optimization to user_files_check_backup() (with patch)
Backup Failure for Course with Large File Sizes or Large Number of Students
Large number of quiz attempts (effectively) break backup
"Fatal Error: Possible Integer Overflow..." during Moodle cronjob of forum posts and course backups
Backup process generate big memory footprint and would stop when have huge number of users
Insufficient memory problem while recovering backup
Restoring a course with 400 users enrolled costs 13k DB queries
backup\backuplib.php user_files_check_backup() is invalid