Watchdog errors with location = http://default/index.php
The first error seems to be due to a failing operation with the Backup &amp; Migrate module. This module is probably configured to make a backup of your database on a scheduled (CRON) interval. As the error message suggests, increasing PHP's max_execution_time setting may help.

The second error you're seeing is due to a missing 'type' column in the file_managed database table. This field is usually added by the Media and/or File Entity modules. You likely updated these modules' code, but didn't run updates. Try running your update.php, or if that fails, disable, uninstall, and re-install the Media and File Entity modules.