500 Internal Server Error when running backup

I'm getting the following error when running the backup:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Apache Server at www.xxx Port 80

This is on a GoDaddy shared hosting Linux package so they will not raise the memory limit. When running the update the following errors were logged.

Type: php
Invalid argument supplied for foreach() in /home/content/c/a/e/xxx/html/sites/all/modules/backup_migrate/backup_migrate.install on line 564.
Backtrace:
backup_migrate_update_6300(a:1:{i:0;a:0:{}})[update.php:160];
.update_do_one(a:3:{i:0;s:14:"backup_migrate";i:1;s:4:"6300";i:2;a:4:{s:7:"sandbox";a:0:{}s:7:"results";a:0:{}s:8:"finished";i:1;s:7:"message";s:0:"";}})[?:?];
..call_user_func_array(a:2:{i:0;s:13:"update_do_one";i:1;a:3:{i:0;s:14:"backup_migrate";i:1;s:4:"6300";i:2;a:4:{s:7:"sandbox";a:0:{}s:7:"results";a:0:{}s:8:"finished";i:1;s:7:"message";s:0:"";}}})[batch.inc:190];
..._batch_process(a:0:{})[batch.inc:106];
...._batch_do(a:0:{})[batch.inc:34];
....._batch_page(a:0:{})[update.php:679];
......index.php

Invalid argument supplied for foreach() in /home/content/c/a/e/xxx/html/sites/all/modules/backup_migrate/backup_migrate.install on line 571.
Severity error