I'm having trouble backing up courses on a server running 1.9.4 (for various reasons this server cannot yet be updated). Backups ran fine up until about a week ago.
Now, for some courses, when I try to manually backup the course using the "Backup" link in the Administration block, I get the first screen where I can select what I want to backup and whether to include user data. I click 'Continue" and the next screen (where I can name the backup file) starts to load. The page starts to display the backup details (i.e., what will be backed up), but for some courses never completes. In other words, the page displays some information but never gets to the point where I get the "Continue" and "Cancel" buttons.
Some courses (smaller courses) work fine, so I know it's not a generic backup issue. Larger courses, however, are where I see the problem. I can't find any consistent pattern in where is stops.
Any pointers for fixing this and any suggestions on how to better debug this issue?