Since the Akeeba upgrades around June I seem to have issues with log files filling up my hosting. I have set rather strict limits for my clients, so this might otherwise not be a critical issue, but I now have many sites that reach their threshold and cause issues. Before June I never had this issue, so it seems this behaviour has changed recently.
It seems the log files now stay there forever. I regularly have to clean up the log files in the administrator/components/com_akeeba/backup folder now.
I set my backups (to AmazonS3) to expire after 5 days, except the one for the first of the month. I would expect the logfiles to expire and be deleted then as well, but they are not. It is also strange that I cannot select the logfiles for expired backups in the Joomla backend (the record is greyed out), but the actual log file for that backup still seems present.
There does not seem to be any funny information in the log, but I still attached a random one just to be sure.
Hopefully you can fix this, and please forgive me if the answer has already been answered earlier ;)