Package: autopostgresqlbackup Sending mails is not set up on my server. So it is hard to debug autopostgresqlbackup as it sends the collected log messages by mail.
One way would be to not delete the log files but to also timestamp and rotate them like the backup files themselves. Actually I would like to run autopostgresqlbackup as a systemd timer unit and then to collect the log output in journald. I open a separate feature request about supporting systemd timers.