by Ken Task.
What does the backup logs look like?
/report/backups/index.php
Had a server that went south due to a 130+ Gig course that would never complete and that caused havoc with db tables related ... report above. Make sure the next backup date makes sense!
I ended up having to truncate all tables related to autobackups ... so it was like the server had never run autobackups to get it working again. I also set a designated directory where backups were to be saved so I could actually see and count them! :|
You might install course sizes plugin ...
https://moodle.org/plugins/report_coursesize
to see if you've got some biggies! :|
'SoS', Ken