Hello Emma,
We have changed to new standard pdf annotation plugin and uninstalled additional pdf submission and pdf feedback plugins.
Now we can perform manual backup and there is no error.
So we have solved one problem. Thank you very much for that.
However we still cannot make automatic backup for all courses. I suppose this is because some courses has "Next backup time" in the past (eg. Jul 12, Aug 30, etc.)
I have tryed to disable automated backups, and scheduled task auto backups, purged all cache but nothing changed in the Backup report. I still see next backup in the past.
So we should flush mdl_backup_courses and mdl_backup_controllers tables?
Old backups would get lost?
What if we would just change all timestamps in 'nextstarttime' column in mdl_backup_courses table to the future, lets say to Jan 4th?
Maybe it would work? What do you think?
Thanks,
M.