This might help.
How big is the course that you are trying to back up?
Compare it's size to the upload_max_filesize in your php.ini file.
If running MAMP, it is in MAMP/conf/php5 folder.
You will need to restart your webserver after changing this vaue.
larry
Backup and restore
Error in backup
This discussion has been locked so you can no longer reply to it.