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You can export cron events via the “Export” button on the Tools -> Cron Events screen.
Cron events will be backed up and restored with your main site backups, because they’re just stored in the cron option in the wp_options database table. What’s your use case for exporting and importing cron events separately to your regular backups?
Do you really have 45 PHP cron events on your site? Or 45 in total? If you have 45 PHP cron events then I strongly encourage you to move that PHP code into a more maintainable system, for example a custom plugin or mu-plugin.