The default excluded directories are wp-content cache the directory for the cache files used by WP super cache and so on. wp-content tmp the directory for the cache files used by DB Cache Reloaded Fix so on. wp-content upgrade the directory for the temp files used by WordPress upgrade function...
Backing up your site can take while, you will want to ensure your PHP and webserver are configured to allow for the script to run long enough to complete the backup..
The backup file of DB is included in the zip file as {the directory name of WordPress}.yyyymmdd hhmmss.sql..
This could be many things, but the most issue is your site is taking time to backup and the server or PHP are timing out.
The bar uses AJAX requests to the site to get the status, the backup process is resource intensive, if your host cannot respond to AJAX calls while the backup is running then you won't see the bar move until it does...
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
Fixed The button on the exclude directories had in it and added the directory name..
Updated When going in to the option page, if backup has been running for at least 12 hours, automatically clear the backup status..
Added After backup completes and adds row to the list, it now adds the delete checkbox as well..
Updated Date in the list now follow the format specified in WordPress configuration..
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