Those six hours is the reason why temporary file aren't immediately deleted when cron tasks run. If then there are many temporary file to delete, a single run isn't sufficient to delete all the files.
You may need to re-install your Backdrop site and restart the import after a failed import. While I've never used that module, rolling back the import may not be enough. I would be sure to have...
Posted2 days 3 hours ago by Alejandro Cremaschi (argiepiano) on:
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The cron job system_cron() will delete temporary files after the max time stipulated by a constant (6 hours)
Those six hours is the reason why temporary file aren't immediately deleted when cron tasks run. If then there are many temporary file to delete, a single run isn't sufficient to delete all the files.