Verify that cron is working

Yeah the cron on OS-side should work very reliable. Never found a reason to doubt that. The web UI admin panel as stated shows a warning if cron didn’t run for more than 30 minutes. To see actual background tasks log, you can set log level to debug (0).

EDIT: And of course you can check the syslog on the server (when using systemd: journalctl) to check the particular cron executions of the webserver user. By default it does not show failures, but one can increase verbosity e.g. via /etc/default/cron, depending on OS.

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