Error when tring to create backup

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Hello. I am trying to create a backup using C5. I was able to do it awhile ago OK but now I get the error message.
Fatal error: Maximum execution time of 30 seconds exceeded in /home/gccham01/public_html/updates/concrete5.4.2/concrete/libraries/backup.php on line 123

- I am trying to backup the database before I do an update to C5. I am currently running 5.4.2

Any ideas?